New Tardis console room? Brill. I'll always take the Capaldi version over any other (appreciate it was Matt's first but I think they used it better with Peter) Frankly an empty room would have been an improvement over Whittaker's
I like it as a combination of my two favorites, the Smith/Capaldi "Neon" room and the Eccleston/Tennant "Coral" room. The variable color lighting is a very nice touch, slightly odd narratively that it exploded
after it regenerated and not
before, and the TARDIS seemed to just drop in a new console room for fun (maybe that'll tie in to something else later). I do think it's a bit empty, and like the Neon room, it would strongly benefit from having a bunch of old crap (affectionate) filling it up.
Also, they didn't persist with the weird duplicate of the TARDIS exterior on the inside of the Crystal room, which was good. I didn't care for that one bit.
Beyond that, the special was fun, had some nice tips of the hat to the other showrunners (the foundry being a major location, the Doctor finally figuring out how to use the Sonic Screwdriver to resonate concrete (or wood, or mortar) into dust in less than four hundred years). Though, speaking of prior showrunners, given Moffat's somewhat-exaggerated reputation for somewhat-benign sexism, I don't think he could've gotten away with writing about how a man will erase his best friend's memory and put a stun-bomb in her brain rather than recognizing, as a woman would, that you can simply opt-out of having self-destructive superpowers.
And, speaking of gender issues, the Meep answering that the Meep disdains all pronouns and should only be referred to as the Meep in all contexts is so peculiar that, if it weren't for the ham-fisted Davros rehabilitation last week, I would suggest the Meep was trying to make a sly critique of the use of neo-pronouns (or people who confidently declare that they refuse to ever use pronouns at all).