Let's address your note one thing at a time:



Outfit- All the characters in this cover have had the same outfit for going on 5 years or more. This cover shows their new outfits after having had the same ones for a long time so I'm not sure what you're talking about. The outfit Kitty is wearing is the same uniform she's had for a decade and a half. Rachel has been wearing this uniform for 3 years. Rogue is wearing the same outfit she sported when she was first introduced into the X-Men in the 80s. Psylocke, after having the same outfit for 2 decades, has a new X-Force look. Same for Storm. And Jubilee, while have a little bit of a different outfit than her original 80s outfit, still sports her yellow trench coat and pink trimmed outfit and sunglasses.



Varied covers- Covers now are far more varied that they have ever been before. But this is a #1 cover for the first issue and nearly all first issues are pose covers like this one showing off the cast of the book with more story driven covers used for later issues. This has been the case since the 80s so I think you're right, it might be you.