Only the Iowa is being converted into a museum. I think the article said somewhere that 2 of the ships will still be maintained to a level of "emergency readyness". Probably those two would be New Jersy and Wyoming. Missouri is such an important historical ship that I can't imagine them scrapping her or using her as a target ship.
Wyoming? I could have sworn the 4th ship was the Wisconsin. The Wyoming is currently an Ohio class boomer, and before that the name was used for BB-32.
But its good to see them preserving the Iowa. Always nice to be able to save them from the scappers or rusting away in a mothball fleet.