Originally Posted by
Grunty
I suspect each of these issues is meant to carry at least one detail that is supposed to play a role down the line for the main storyline of Dawn of X.
Besides the obvious one with Storm in the Jean Grey/Emma Frost one, there is Lady Masterminds snooping around in the old X-mansion (she was rather prominently visible among Villain entry in House of X which raises my suspicion), plus Thunderbirds ghost who might not have been an illusion in Nightcrawlers.
And here we have a seperated island being bought and all that around it.
Though using something labeled as Giant Sized issue with major character names attached just to have these details in place for later, while the main story of the actual books feels so bareone, can be seen as questionable choice. Unless people really want these issues for the artwork, but that's for sales to show if it works or not.
Now on to see what details might be in the Fantomex one.