This will be my third year going to Youmacon, and I'm coming from across the border. I've booked my room and will probably be pre-registering sometime this summer.
I know for sure I'll be cosplaying Kurisu (along with my friend as Mayuri) from Steins;Gate, and I'll be bringing my Rabi~en~Rose cosplay as well. I'm still debating on a third costume though.
As for Cobo, I think they simply needed a bit more space. Although Youma's not a huge con, it's definitely been growing, so I suppose they felt as though the additional space would be for the best. You will both have a great time, as it's a lovely con to be a part of.