December 2018
If you look at the third picture on the Command and Conquer: Rivals page in the play store (not sure about app store), you will see a 100 tiberium aircraft that is not the hammerhead. Could this be EA teasing a new GDI unit? Sadly I could not find the picture since there is no option to link screenshots.
December 2018
I think you are talking about this one and yeah it's not available in the game so why not it may be!
December 2018
December 2018 - last edited December 2018
Also, there's an Avatar fighting that Mammoth Tank!
EDIT:
Looks like the Mammoth costs 200 Tib as well.
December 2018