Great art, i think it's a hydra, maybe its
Apocalypse Hydra according to that list, and the name suits it just fine. Maybe conflux will still be a 3 color theme, but instead of a color with both is allies, maybe it's a color with both it's enemies,
Bant could change from GWU to RWU. In the wizards site they are showing in some articles some of the 3 color dragons cycle from invasion, but there is another cycle of 3 color dragons in planar chaos, my guess is that the shards in conflux will have the colors of the second cycle of the dragons, and the shards would be something like this:
Bant (from GWU to RWU),
Naya (from RGW to BGW), Esper (from WUB to GUB),
Grixis (from UBR to WBR) and
Jund (from BRG to URG) but that's just me guessing...