Highly unlikely. Bandai could not:
1. make alot of profit out of it due to only oldfags like us would buy. Newfag will be like Hur?? Wut??? Da shyt iz tiz??
2. milk it. Well maybe 2 or 3 variations but not as much as a zaku or strike frame. Plus the previous factor means that sales will be targeted as selective cliche audience out of the already filtered out newer buyers that do not know UC universe making sales of variations even less then its original counterpart.

The most probable RG release will be something from Unicorn to coincide release of epi6 at the end of the year or continue the RG seed trend to coincide with currently airing seed remastered.

RG GM

i know it's impossible for RG Ex-S... 

maybe they are following with Seed MG releas, when later new Seed Destiny MGs are released, then they will make Seed Destiny RGs also

dunno where this from, so unsure it's reliable or not 
PG Unicorn & Banshee aside, seems like Wing series getting a revamped HG line, HGAC