The new A Series offers capacity - which is what most of us have been asking for all along. Plus I'm not a fan of Sony's implementation of the "pause" on the X series, as the screen would always go on every time I pressed a control - made the battery life not too spectacular. And I also prefer tactile controls, and the upcoming A Series is TACTILE.
As for slacker, I have that on my Android phone, totally useless without wifi on the X Series IMO - just filler.
Besides, if you'd read my first post in this thread, you'd know why I want the new A Series.