B&N DRM support has been in the Preview versions of ADE for awhile (these have all been native apps as well). There is some ePub3 support, at least with regards to vertical text modes (for Asian scripts).
I see that Sony PRS-T1 is on the 'supported devices' list. Very interesting, I'll have to try that.
[UPDATE:] Nope, PRS-T1 is not detected (on Mac OS anyway).
Last edited by tomsem; 09-21-2012 at 02:26 PM.