At SHOT magpul have displayed their new EMAG and a 7.62mm PMAG.
There is not much information available and some of the forums I have read are saying contradictory things. This is my take on it, I may be wrong and if I am I will update this post with the correct information.
The EMAG is a 5.56mm slick-sided STANAG magazine. It is compatible with all rifles that use STANAG magazines, such as the HK416, FN2000, Steyr AUG (NATO variant) and many other rifles civilian and military . This is a very clever move by Magpul and could dramatically increase their export sales.
UPDATE: I was right (that does not happen very often!). EMAG is short for Export Magazine. It will retail for $22.95.
One more teaser photo from Magpul after the jump (frontpage is currently clogged up with photos)