The theater told me that both will be in 2D...which is fine with me because I'd rather watch it the first time in 2D anyway...they are having multiple other screenings at midnight as well as the 3D IMAX fan screening too...but the novelty of getting to see them both back to back won out over the other showings...
I think STID is going to be in 3D at my theater. I'll be seeing it again with my brother over the weekend, so I can see it in 2D then.
I agree that 3D or not doesn't really matter. Just liked the idea of the double feature and twice the fun at the theater.