Browsing Arnies I found that DBOYI and A&K have already released new models, not sure when they will be available in the states. Judging for the photo’s the look pretty bad ass.
There will be the following models:
SPR NOD1
SPR NOD2
SR-25
SR-25K
M16A4 (with full RIS)
M1 Grand (I think?)
Source: Arnies Airsoft
Enough with the M-series. They need to start making different guns.