Just heard it from some Aussie guys that talk to Mcmillan reguarly. I heard it was getting a longer forend, over the barrel bipod mount and a re jigged removeable stock. I am supposed to get a pic shortly so if allowed I'll post it.
The 2010 Shot Show was a resounding success for Ashbury! One of the highlights for Ashbury Precision Ordnance Mfg (APO) at the 2010 Shot Show was the debut of our engineering collaboration with the McMillan USA family on the ATAC™-50 Tactical Rifle. The McMillan brand is perhaps one of the best known in the firearms industry and always associated with quality, precision and innovation. We truly consider it an honor and privilege that Kelly and Ryan McMillan chose Ashbury Rapid Product Development Center to explore the next generation advancements in design for their awesome TAC-50 tactical rifle. Known for producing the industry’s most extensive line of high quality fiberglass and composite rifle stocks, McMillan wanted to evolve the TAC-50 rifle platform to meet the needs of long range shooting enthusiasts, and demanding military snipers working in complex terrain. The ATAC™-50 is based on the patents pending SABER®-FORSST® modular rifle stock chassis system design now being manufactured by APO for small to large caliber rifle platforms.