I hate to break it to you, but I doubt they will evre add Eyefinity support for ME2. There were a few threads on the Bioware forums about Eyefinity for ME2 months ago and the official response was that they weren't going to add it anytime. You can read the official response here at the end of the thread:
http://social.bioware.com/forum/1/topic/106/index/1533069/1
Basically to me it sounds like "we're too lazy to add Eyefinity support" or "we really don't care about adding Eyefinity support". Pretty disappointing and it was not long after that official posting and the closing of the Eyefinity threads that I uninstalled ME2. Maybe someday if I am really bored I'll reinstall it and finish it, but that decision was a real disappointing move from Bioware. Strange that they bothered to add Eyefinity support for Dragon Age, but won't bother to do it for Mass Effect 2.
Well Dragon Age and Mass Effect use different game engines. Dragon Age doesn't really 100% work anyway, due to the annoyances i always play it single screen.
They have mentioned money a few times so i'd be more inclined to think that they have not been given enough funds to finish this off, or time allocated.