The mag release as described in Farnam's piece is switchable/ambidextrous. Looking at the picture of the new magazine style above (which has been shipping to stores) I would tend to disagree that it is "switchable". The notch appears to be engaged from the front--not the side. This would support a permanent ambidextrous release, possibly like that used in HK pistols.
The second issue is the safety. From Farnam, "The SF45 will have an ambidextrous, two-position, manual safety. It is designed to mostly disengage itself as the shooter acquires a normal, shooting grip. But, it must be manually, consciously re-engaged. Resembles a cross-bolt."
I suspect that Glock can design the ambi release without changing the parts count of the pistol, however I have no idea how the safety will be designed.