Pretty much. The OS does have a few changes, but the "new" start button is a very poor joke. It hides in the lower left corner and only pops up when moused over.
Brings up an improved start page, but still not a start menu like we're used to.
ModernMix seems to work ok, as do Start8 1.17 beta, Decor8 5.01 beta and WinFX 5.11 beta.
BTW, I have Windows 8.1 in a virtual machine.