They're not getting rid of the start menu, they're changing it.
Nope, they have removed both the resizeable start menu and the option to use the start screen instead and have created a new start menu. The regedit key discussed a few posts back confirms this. They might revert back, but I have little faith they actually will.
They aren't changing the start menu that was in previous builds, they created a new one. They supposedly are going to add features back to this new start menu. The problem with that is, that the start screen in previous builds (and in Windows 8/1) is heaps better, so why re-create it instead of just leaving the code in there for us to use.
Now the registry key will bring the old startmenu /screen back, but I bet that in a few builds that key won't do anything since by then Microsoft will have removed the code from the code base, and effectively forcing this down our throats. Deja vu ! (as in they made the exact same error with the release of Windows 8, clearly showing they haven't learned their lesson, a recipe for disaster).