-Captain Britain has died and come back...with a new costume.
-John the Skrull dies.
-Faiza (who seemed to be an insignificant character at first) becomes the new wielder of Excalibur.
And that's just the first five issues!
The first story arc was a direct SI tie-in but it was pretty damn good on it's own merit. Besides fighting the Skrull army, the first arc was mainly about establishing the cast of characters as a cohesive unit, which Cornell does well.