Doubt it that RnR 3 will have its own anime just like its 2 previous series.
We already know that RnR Tribe anime was phail, quickened, and it didn't have that great point of a story
RnR 3 doesn't have much of a manga also. I dunno whether i should call it as manga since it only has 2 chapters, made by Ryou Takamisaki, and only promotes about transformation
Well, i indeed heard a lot that people prefer EXE to Ryuusei, and lots of reasons were mentioned. From my own opinion, EXE has better storyline than Ryuusei. I guess some gamers don't only pay attention to gameplay only but the content of the game itself (such as storyline, plot, action and occurances, tides between characters, etc.) which make it interesting