Oh wow, this one's a toughie.
I know I'll have:
Marth ( Super Smash Brother's Brawl )
Aerith ( Final Fantasy VII )
Micaiah ( Fire Emblem: Radiant Dawn )
Soren ( Fire Emblem: Path of Radiance )
But as for something new by then? I'm totally at a loss. After doing so much Fire Emblem, I know I'll probably work on a few other series. I've been debating on something a bit older like Chrono Cross and perhaps doing a Serge cosplay. I'm tossing around other Final Fantasy's like perhaps doing Rinoa or Yuna, or going older with Terra. Hrm, also I love Shadow Hearts so I may actually try my hand at Yuri.
To be honest, I really have no idea! I bet once I get to Ikkicon and see all these really cool cosplays I'll have a better idea.