As exciting as this would be, I most certainly believe it's fake.
-There's already an official Rayman Twitter account, it posts very infrequently, but it exists, makes no sense to make a new Twitter account just for one game.
-Crash and Spyro's trilogies all have one shared gameplay style with improvements made in each successor. Rayman 1 is a 2D Platformer, Rayman 2 and 3 are 3D. And while 3 does build off on some of 2's ideas, they still play pretty differently. A trilogy remake like this wouldn't be impossible, but it would be a much larger feat compared to the Crash N-Sane Trilogy or even the rumored Spyro trilogy.