They're going to have to start cranking out C-store variants of all the lower tier ships to help generate income for the F2P switchover. Once playing is free you are going to have to pay for all the good stuff, so there's gotta be stuff worth paying for at every level.
T5 has enough love as it is, the rest of the tiers are what need filling out. Only T5 ships that could use some an additional skin is the Dreadnought and Galaxy-R (which would give the Nebula a third option as well). And any skins added to the lower tier ships with a T5 refit would probably also get the new skins.
I'd be slightly amused if ALL the ship varients coming out are for the KDF, lord knows they need them more then the feds do.