I'm sorry but I have to say that new layout is not very usable with a tablet. Positive thing is that rendering speed is fast even with the default browser.

Negative thing is that layout wastes way too much vertical space. For example empty space between message bodies is half a screen or even full screen height if there is signature. In new posts view you can seen only 3-4 topics in a single view. Old Mobile II theme was ultra efficient with screen horizontal space and I liked it a lot.