I wonder if the design of the Franklin will show some resemblance to one of the other designs on Marcus' powerwall from STiD.
It will look like this ship from Marcus' office:
http://2.bp.blogspot.com/--lUUjPoNv...+Constitution+class+Admiral+Marcus+office.jpg
I'm not so sure on that. I certainly wouldn't rule it out as being possible, but IMHO if they were going to have it be a TOS Connie than the bridge would look more like the one from TOS.
No, they're not going to recreate a cardboard 60s the way TNG and DS9 did, because "that's what it looked like" (and also because that would look terrible). Something similar to the Kelvin bridge is all that's needed to establish the ship as older. The exterior looking like a Connie is all that's required for the homage.