I'd like to see...
sandbox zone(s)
rvr-style zone(s)
a new class (with two advanced class choices)
more warzones/ops of course
some sort of graphical upgrade, perhaps
extension of existing class stories
big legacy system enhancement with things like stat boosts/accessible abilities that affect combat, *ONLY* purchaseable with legacy level xp not credits (aka an alternate advancement system)
Not expecting all of this in one pack, but hopefully in a couple...
*and no level cap increase!!!!!!* I don't want to be re-leveling my characters that are already leveled, and have all my gear/content/dungeons/operations instantly become useless and invalidated.
Edit, I also forgot, I'd love to see the ability to customize ship decorations etc. on the interior so your ship is actually, ya'know, YOUR ship and not carbon-copy #419841. Trophies from boss kills, rare craftables, and standard decorations would rock!