New issue is coming out later today for mobile devices, next Tuesday for PCs/Macs, and start shipping about next Monday for print copies. Includes a feature of the Prometheans in Halo 4, so there is probably some new information about them:
If I can base an idea around past GameInformers, then my guess is its nothing new. About this time in a games production, most of the new info comes from either the company or an expo. With PAX just now becoming a letting out the last of the info, expect to see the last of the new stuff to come directly from 343 on Waypoint.
In short, GameInformer is just there to inform those who don’t follow the sources as close as those on the forums.
I guess as halo 4 gets closer to launch GI will be doing more things over the enemies of halo 4.
I recently bought a OXM magazine and each page was halo related.
Another leak as bad as the one in April? 
Seriously though, it’ll probably be a re-cap of the Prometheans and maybe Storm.
Thinking about it, if someone could post what they read on the mobile version, that would be great.
Bump, since most people are now getting home from work/school.