I would like to see a Nightmare mode for flashpoints. I do not require any gear or shiny loot from this, I just wish to see a 4man challenge that requires a coordinated team. I.e, it would require you to play with 3 friends and probably use voice chat. That would be awesome.
I don't know 7 people that are interested in PvE, and I myself am not interested enough to dedicate myself to join an active raiding guild because that typically means you lose 3 evenings or more a week. I can easily take 3 friends with me and do things, though... but the content is so damn boring, because it's too easy for a coordinated team.
So that's what I would've wanted to see.
Nightmare mode for Flashpoints would indeed be nice
. HM just isn't enough of a challenge for me anymore unless I'm in a group that has no idea what they're doing.
... And now I'm picturing that Assassin who soloed Malgus on HM doing it again on NiM