X-men cover isn't an line up. X-men has no roster it is almost anthology series from my understanding of it the first story is probably Cyclops centric hence the people on the cover.
I wonder what it is about the Status Quo that make Wolverine solo book not needed. I can't see them not putting out Wolverine book which has always done at worse solid without good reason. I think they want to put emphasis on "X-line" itself and at time Wolverine has gotten "too much" focus I think that might play a part in no solos. Hickman is about restoring the X-men to glory so putting the X-line first kinda make sense.