As much as I love .hack, I doubt we'll see a crossover, and definitely not anytime soon - I'd expect something with FFXV before that.

I'm super excited for this release, though. I enjoyed the story of both games, but I feel G.U. really improved on some of the core mechanics of IMOQ. The original 4 games felt really repetitive to me, and I got discouraged when I spent an hour going through a dungeon in Q, just to die to the boss.. really didn't feel like rerunning the dungeon right then. G.U. had more variable dungeons, at least.