On 22nd May, South Korean fansite Red2.net uncovered a set of concept art by Michael Phillippi which was apparently part of a mobile Command & Conquer game. Considering how these images were uploaded to his ArtStation profile over a year ago, and how game developers always announce games before having their art uploaded and impose NDAs on their staff, it is safe to assume that this game was cancelled by the time of the upload. The game was apparently merely called Command & Conquer (sounds familiar?) and its logo used the design only ever seen in the original 2006 logo for Tiberium Wars.
We believe this art is legitimate, as proven by the rest of Phillippi's profile that shows his work on Warhammer Online: Age of Reckoning and the much-hated Dungeon Keeper Mobile, among other EA-published projects. Naturally, we've mirrored all of this art in our gallery for safe keeping.
UPDATE (30 May): Updated gallery with two environment concepts by another ex-Mythic employee, Eric Polak.