speaking generally, lots of stuff works. It all depends on the individual product.
For example Profiler works, as do all the "code" related things (WinEvent, StringTheory, SelfService and so on).
The ones that don't work are "screen" related. Hotdates, Send-To and so on.
Some work "partially" - FM3 for example is still converting files, but there's no "web" version of the Runtime File Manager (at least not yet.)
cheers
Bruce