they are getting the Triumph. Is like a updated EVO but its pure Google. If/when they get one it will be some time so that the cost will be low enough for people to want to buy it.
The Optimus V is Great little starter phone IMO. I believe its a dualcore. but not in the sense you would like it to be. The Triumph will be a single core but should be plenty fast . What would you want the phone to do? I would like a new phone just because, My Epic would be good enough for another 2 years. I havent read anything else about new phones for Virgin. If a dualcore phone is something you really want and want it now , you might have consider a contract with a carrier to get 1.