>>103248700FusionFall Legacy IS still going to be a thing, y'know. I think they just went on radio silence due to their attempt of implementing Total Drama into the series being greeted with a C&D from FreshTV. Plus, I think bringing the original game back ended up taking priority over remaking it.
That said, since Retro is now fully playable, save for a couple minor features still needed to be implemented, they might be able to continue development on Legacy.