According to Magpul's Facebook page,
The PMAG 17 GL9 is a 17 round Glock 9mm handgun magazine featuring a new proprietary all-polymer construction for flawless reliability and durability over thousands of rounds. High visibility anti-tilt follower, SS spring, easily removable floorplate for cleaning, Dot matrix for mag marking, ridged floorplate edges for better grip, 17rd indicator windows. Drops free loaded or unloaded. The same boring reliability you expect from an OEM magazine. MSRP $15.95
In the run up to SHOT Show Magpul has been putting out lots of news, capturing the lions share of pre-show coverage. Between their new D60 drum for rifles that accept standard AR magazines and this new Glock release, it's going to be a good year for Magpul.