I have a Nexus 7 with Android 4.3. Until now that has the only Android UI I know of (status bar on top, back/home/multitasking buttons on bottom, and so forth). Today I used an Asus Transformer running Android 4.0 (ICS). It has the older tablet UI that I didn't see before -- only one bar on the bottom. And I actually kind of like it. Any 'historians' here who know why Google abandoned this UI for tablets?