I'm sure you know this, but in case you don't - ActionBarSherlock is incredibly easy to use for backporting the actionbar, tabs, and fragments to 2.x.
Yup I'll definitely use ABS when I backport it.
Tablet support would be much appreciated!
Tablet support is definitely coming. I've been inundated with request for a few things I didn't see coming, so as soon as I clear those items out I will get straight on to tablet support.