I'm still advocating putting WV refit in as an optional C-hull upgrade for Colorado, since that ship really needs some love, anyway. A WV refit would mean Colorado has something going for it compared to all the other tier 7 battleships. 21 knots wouldn't feel so bad if it at least had good AA and/or secondaries to compensate for it.
On that note, I'm actually hoping for a rework of the US mid-tier battleships, along with a side-branch that includes the rest of the standard-types:
1.) Branch off NY. Have it lead to both Nevada (or possibly Pennsylvania) and New Mex at tier 6. Nevada/Penna in late-war refit configuration, with 5"/38 dual purpose secondary battery and Oerlikons/Bofors. Nevada could slot right in, giving up two guns compared to NM for the AA. Pennsylvania would basically be Arizona, but with better AA. Some adjustments would have to be made to New Mexico in order to not have Penna be outright superior. We already have Arizona as a class representative for Pennsylvania, but if I am honest, Pennsylvania herself, in her late-war guise, is my favorite of the USN standard-type battleships, and my heart really wants to see her in that configuration in the game. Nevada would be close enough, I guess.
2.) Possibly 1941 Oklahoma as a tier 5 prem, though I'm not so sure about this one. Poor New York would probably be even more obsolete than it already is, though, with Texas around.
3.) Tennessee at tier 7, with late-war refit. Similar to Colorado, but with Arizona-like 14" guns. They'd need some nice accuracy to compensate for the lack of overmatch capability.
4.) Colorado gets late-war WV refit as an optional C-hull sidegrade, because it is the dog of tier 7 battleships and could use it.
5.) SoDak '20 at tier 8, with hypothetical late-war refit: Montana firepower in a slow, stubby package. A 23-knot doom-snail of a ship that could be seriously hilarious.
6.) Branch back in from SoDak '20 to Iowa, so we don't have to go to paperships for 9 and 10.