The challenge with the Corvette is that they have to push it far enough up the Fed rank structure to make it "exclusive" and "only for the true Federalists, not twinky pickers"... But that means a whole load of development resource spent on a ship that by design, only a fraction of the players will reach within weeks, if at all?
Much as I think the concept that was "accidentally" sneak peeked too early looked great; I get the feeling the really big ships will be a couple of expansions away. Also, can you imagine paying half a billion credits for a Corvette and then having your powerplant sniped by a Vulture?
I'd love to see the Panther, so long as the hard point placements give it a chance to be defensive as a trader and not a floating cashpoint for pirates!