Question about preorder for Halo 5

So, on the microsoft store there is an ad for halo for XB1, with a snapshot of the chief, as he appeared in the E3 teaser trailer 343 released. I’m curious though, why is there a preorder available when we have no gameplay trailers or information on this title at all yet? Where’s the advertising campaign for this new and mysterious title for the halo series? Is this just a glitch, a fund raising campaign, or what?

Honestly, not a clue. We don’t even have an official name yet.