It'd be better to wait until we have something that doesn't resemble a ghost ship first XD
Do you think that the 16:9, 16:10 mainhalls (which should be different, please), will be vert- or hor+? vert- is a lot easier, but I think you lose out on some anis and interface elements. Maybe a bit of both?
A compromise I'd settle with is letterboxing, but if you can do better, please do.