It's a huge improvement and I'm very excited for it. One issue I have with it, though, is that I was hoping they'd make the virtual buttons appear "on demand" somehow, so you can take advantage of the "full" screen in all situations. But even better, they should've done something like in Meego Harmatan, where you go "back" or to the home page by sliding the screen to the side.

That could create an issue in games perhaps, if not done right, but they could've probably found a way to do it right. Matias himself says gestures are better than buttons, so he should've tried to get rid of those buttons completely, too. Then you could enjoy the full screen in all situations, and you could use the full "HD" resolution. Oh well, maybe they can implement it for Android 5.0 (right, Matias? - if you're reading this).