My thoughts.
The Dinobot combiner - looks good so far.
Perceptor - good idea for an alt mode, and the robot mode looks great. (Although there seems to be a few mis-transformations around the slides)
Lugnut - meh
Jazz - about time! Looks fantiastic.
Scourge - probably the one Generations figure I haven't fallen in love with at first glance
Legends G1 - sweet
Thunderwing - looks ok
Tracks - alt mode looks a little strange, but the robot looks fantastic
Windcharger - basic Scout concept, but looks good
Grapple - too similar to Inferno, but still looks great
Constructicons - meh
Generations and Classics molds though will be brought on sight, without out any questions. AA/HFTD stuff though is a different story.