Going on their plan of doing 2 HM dungeons per patch + 1 new one, that would put them out to 2.7, but if they plan on 2.5 being the final, I'd expect Amdapor Keep and Wanderer's Palace to not get hard versions, and then probably Cutter's Cry and The Sunken Temple of Qarn to not get hard versions since they are non-story optional dungeons.

Lots of good information though, I can't wait for the Live Letter, so they can start teasing out some more 2.4 stuff leading up to the next one