More “Gen 4″ Glock Information?

[Update 12/18/2009: Gen 4 Glock photo is here.]

During the past months I have been bringing you information about the new “Gen 4 Glock” pistols that are due at the 2010 SHOT Show.  One of the features that I believe the fourth generation Glock pistols will have is a reversible magazine release.

In the latest Safariland holster fitting charts (dated September 24, 2009), the company lists Glock 17, 19, 22, and 23 pistols with a “dual magazine release” under a separate entry from the Glock 17, etc.  Are these the new Glock pistols?