This has already been mentioned a few times in the "MC 10 has been released" area, but since I'm trying 10.0.132 I thought I should mention here that the icon tree did not seem to update with this version either. I installed 10 over 9.1, and everything is fine except that the icon tree in the upper left is still defaulting to 9.1-style. And, yes, I'm using the Thunderstorm skin.
Oh, and on a side note: although I'm super exicted by the new MC 10, I have to admit that lately it's been the free King Sparta plug-ins that elevate this product for me above and beyond the competition -- specifically the chart, bio, lyric and cover finders, the "the" remover, and the bio/lyric viewer, all of which are much more useful than the similiar options in MC (their speed and accuracy have done wonders with my 15,000-song database). If you ever integrated the SpartaSoft plugs into your program, so that it was easier for MC newbies to use 'em (instead of having to find them and then install them all one at a time), then I think you'd have an even more powerful product. Love the new build, though, regardless.
--Luke