this review will tell you what you need to know:
http/www.notebookcheck.net/MSI-GE70-Apache-Notebook-Review.116844.0.html
but to answer your questions more directly
idle / chilled battery usage = 2 hours 40 mins - its pretty crap.
temperature at idle: honestly pretty good, hitting only 28oC at some parts.
temperature during gaming: ranging from 47oC to 57oC for front and back - its pretty bad but there are hotter, so swings and roundabouts, still definitely get a cooling stand.
intel ac 3160 internet card - ac cards were made for areas with lots of wifi - like a university / college campus, so it packs long range but not so high speeds if that makes sense. But from the review it wasn't much of a problem and kept fairly consistent signal.