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My guess would be within a month after Ghost Rider, seeing how he has a forum page: https://forums.marvelheroes.com/categories/nova (for those that are interested).
Though, from the quick loo, it'll be Sam, not Rich. Don't know enough to comment, so know that before you decide. I'm going to assume that an Enhanced costume will eventually come for the other character of him not used.
No. Nightcralwer and Moon Knight are next in line. I think there are legal issues with Nova and we ll have to wait