I would really like the option to choose a gender though I wouldn't mind if we still don't get the option (P3P being an exception). But maybe, if there's only one gender, they could make a female character the MC just for a change
About yuri/yaoi options. I don't really care, though I would like an option at the beginning of the playthrough to count them out. People can have their yuri/yaoi of course, but I wouldn't want to accidentally get said route since that's not my cup of tea
About which platform it might be: Please don't quote me on this, but didn't Atlus say once that Catherine was kind of a test for a HD game? If that's true then I don't think we'll get P5 for a handheld console (Vita is awesome, looking at P4G, but, mind you, I am not sure about 3ds doing a great job for this. Though I wouldn't care either way since I've got both handhelds).