Glad to hear from someone else who made it to the show - one of these days I may have to try to catch one of them. It sounds like this could have been a good year to see Outlaw's offerings. If you haven't checked it out yet, take a spin through this thread and add any details that are still missing.
Based just on past experience, I would not expect a trade-in program (unless of course you're in your 30-day trial period). Of course, resale value on used Outlaw gear is generally excellent. If the upgrade bug demands a 7900 and your house's structure will hold it up, you could always put the 7700 on Audiogon and let the proceeds help pay for the 7900.