I inquired about all of them to Magpul, and they say "Early Summer" 2015..
Also, I doubt the AK Furniture will ship without the mag.
The ONLY good thing about the delay of this mag, means it is likely went back into "R&D" stages, meaning they are highly likely doing everything they can to make this the "Perfect Polymer AK Magazine" that they can possibly make and have made "Trail & Error" versions along the way and are looking for the best on after doing rigorous testing on them.
Its gonna be good, even without steel reinforced feedlips being Magpul's Polymer is so damn strong, opposed to traditional polymer that needs steel lined Feedlips like a "Circle 10" mag for example.
Would be nice if a Magpul Rep would speak on this though!! (Rather than just taking my word for it)
They also said that the "Sand" Mag was even stronger than the "M3" Polymer, so I was hoping that they would use that material to make the "M3 AK Pmag" (They will be making one in "Sand" though, so it will likely be even stronger and be a good reason for those to sell also.)