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Northstar appears on the cover for UXM #541 in an exclusive preview over at Newsarama:

Click image for larger version.  Name: uncx541_dc11_lr_00.jpg  Views: 387  Size: 183.3 KB  ID: 1317

The way his speed trails are drawn pretty much confirms that he's the character in the preview panel shown at the end of the previous issue and will be appearing inside.