I Went to GAME yesterday so that i could pre order Halo 4 and i asked the guy have you got the Limited Edition of Halo 4 available for Pre-Order yet.
He replied with not at the moment we might in a few weeks well he said about 5-6 weeks.
Anyway i then asked is this involving every GAME Store? And he said yes but some stores may get it before others ( Be able to pre-order sooner )
I Then asked if there will be a Midnight release? He said Yes i can tell you now there will 100& be one. Halo 4 is doing great on Pre-Orders at the moment.
So no you can not Pre-Order the LE of Halo 4 at GAME yet and yes the Pre-orders are doing fine at the moment 
Just thought i would let you guys know 