I'm a little worried that it's coming out too soon, actually. Since it's supposed to tie everything up into a neat little finish*, my ideal version would have the exploration and individual gun variety of ME1 added back in with a bunch of missions that further flesh out the various characters (of which there are now almost too many to care much about). Since ME3 coming out a couple of years after ME2, and will have a big Earth component, and have multiplayer, I'm a little worried that it will be a shorter game on a more linear plot.
*although I think an MMO version of some sort is probable
*although I think an MMO version of some sort is probable