WIP means "work in progress". It will be added to the game at a later point.
what problem? do you mean the WIP's? because those Aren't problems Hyao just has those are bases he has yet to actually add the content for those in yet. also as YourFather'sNewBF said its usually the 29th. there is going to be an update to the public build this month at the end which is prolly tomorrow.