PS4 users can see the Cabal Hover Tank by going
Playstation Store > Destiny > Explore Destiny > then pushing to the right
A video partially obscures it, but the Cabal tank is clearly visible after the video ends.
Here are the other two images in the wallpaper.
http://t.co/2s01eUVBSD
http://t.co/rw03KeXeS3
That Halo Dude pointed out that the Cabal Hover Tank appears in action at 0:57 in the Bungie Mars trailer. Thanks for the find!
https://m.youtube.com/watch?v=Kkv74QxryUI
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Wow this completely caught me off guard I thought it would be a troll