Just to let you guys know, its up for download now (which I'm doing now) on autodesk's subscription site.

Its a full update including extension one (muscle) included, when I say full I mean its a full install, not like extension 1.

Theres a 46 page pdf of whats new and how to use it, just having a browse some of the tools look pretty niftey, tweek looks cool as you can select any componant thats under the mouse cursor, hit ' on the keyboard and move, rotate etc etc, without needing to select it, should save a few mouse clicks when cleaning up a model and tweeking it!