-The two missing wizards. A classic conundrum; what were the Blue Wizards up to during all this, and what happened to them?
Oh he talks about that in other things:
Basically, the Blue Wizards are two (of the five) Wizards who went far to the lands in the East (Gandalf never even went to the East), where they were "behind the lines" as it were, in the barbarian lands far to the east of even Rhun, starting up local rebellions in lands Sauron occupied, etc. This had a cumulative effect on the whole war as it meant that less Easterlings came to fight in Gondor than might have. but Tolkien never really decided what *ultimately* happened to them, but the theory he had is that they "strayed from their path"; not necessarily even in a bad way. Just as Radagast started caring about Beasts and Birds, specifically what he was there to protect, more than the "big picture", the Blue Wizards started caring about the local lands in the East they were protecting more than the whole of Middle-earth. The idea is that they ultimately "went native" and stayed, just never returning even after Sauron was gone. Tolkien "suspects" that they ultimately passed on much of their knowledge to the local population and were thus the start of several of the "magic cults" which have existed down to the modern day (not "Illuminati", I mean like, wizards and witches in like Medieval Europe, etc.) this could be seen as either good or bad and even Tolkien never really finalized his decision: did they "go native" because they started trying to set themselves up as local lords, like Saruman did? Or is it really just they loved and cared about the lands they had defended for so long that they just stayed their as protectors that never left? We don't know.
-A detail I had forgotten: Saruman has made a Ring of Power. Whatever happened to this ring? Was it lost in the chaos of the destruction of Isengard, or lying in the rubble somewhere like the palantir? Did Saruman manage to hold on to it and take it when he went to The Shire? In that case, what happened to it after he died if it didn't dissolve along with his body? And possibly most important: did Sauron know, and was it under the control of the One Ring? Unlikely on the second, and perhaps also the first. (This just me hunting around for possible inspiration for that heresy of heresies: writing my own stories of Middle-earth--gasp!)
Slow down there, slow down there: It is *not* a "Ring of Power"; there are only 20 Rings of Power (3 for Elves, 7 for Dwarves, 9 for Men, 1 for Sauron). ****they do mention that the Elves made other magic rings before that, but they were "essays in the craft"; that is, in the centuries that they were developing and refining "ring technology" or the "craft of making magic rings" they of course made many many "rough draft" rings of varying power. But none come close to the Great Rings. ***notice that Gandalf himself suspected that Bilbo's magic ring might just have been one of those "lesser rings", which is why he tried to convince himself it couldn't be a Great Ring (re-read the second chapter of FOTR).
Saruman doesn't have "a Ring of Power" which you read that line that "he had a ring on his finger". It's not a serious upgrade anymore than that he's a "magical wizard" in the first place. ***the entire point of that is just to show that he is TRYING to make his own rings, and he's trying to imitate Sauron, and this shows***how far he has fallen. But that doesn't mean he's GOOD at MAKING them yet!
It's just another of his gimmicks, like the "fire of Orthanc" (in the books it is ambiguous if this is a magical attack or blasting powder; i personally always thought it was gunpowder, as it kind of fits with Saruman's whole motif of using "scientific knowledge" for corrupted ends like making weapons and industrialization, etc.; the movies fall on the side of "it was gunpowder" but they said that's because they honestly interpret the text to mean that, which I frankly already agreed with)
So don't worry or think this is some major plot point: Saruman has lots of little magical gimmicks and toys, and you should be no more worried about this specific "ring" than "wow, what other types of wizard artifacts are in there"?
In case you're wondering about what happened to Orthanc, though: Aragorn granted Isengard and Nan Curunir (the surrounding valley) to the Elves for trees to return, but he regained Orthanc tower as part of his birthright as king (it was built by the old kings). "Unfinished Tales" mentions (though not as a narrative) that Aragorn & Co. would some time later make a thorough exploration of Orthanc tower, where Aragorn found all sorts of goodies that Saruman had been hiding, i.e. the original Star of Elendil.
-So it seems Tolkien did indeed write something about Queen Beruthiel and her mysterious cats! (Forgive my ignorance up till now, I haven't yet read Unfinished Tales.)
Oh that's just "local folklore"; logically all sorts of local folklore is present in countries, their own backstory, etc. and "Queen Beruthiel" is just an evil queen of old Gondor, who was sort of a sorceress and spied on her enemies using her magic cats, but eventually everyone turned on her and the king threw her out; it's really not a big story its just a fable even in Gondor; it sounds cool because he mentions it in passing in a tantalizing way; but that's the point; real people wouldn't bother to fully explain their folklore, i.e. if I were to say "yeah right, Snow White, lets eat the strange apples" in a sarcastic way, you'd know what I was talking about but stranger would not; similarly, Aragorn *mentions* Beruthiel in an off-hand way as just a part of folklore.