Now after seeing the rewards teased, I think I'll get the t90 mage tank for pushing 100% enrage telos with animate dead. I like to bruteforce hard bosses, so this is exactly the reward that fits me best.
Don't forget the "5th Front" Jmod either hinted/joked on...
Personally I think it will be part of the 4th Front. So the 4th Front may lead us to not only a new boss for that specific front, but also the big boss for the entire EGW "dungeon".
Remember in GWD1, we have Nex as the final end bass, and n GWD2 we have Telos. It is only logical to see a Nex/Telos style of final boss in GWD3. As it stands now the "5th front" or the more likely the "4th Front+", I think, will give us a Shadow boss which is considerably quite a bit stronger than the bosses in the first 4th front.
ignoble onesaid: Maybe 5th front is just the creatures that came out of the monolith from the shadow place
Azzanadra the new god has taken care of the petty shadow creatures, no saying there may be bigger ones than he can chew coming though.
The past 2 god war dungeons all have a bigger and badder boss in Nex and Telos, it will only be surprising if GWD3 doesn't have a final boss. A Shadow boss seems fit to GWD3. Perhaps Vos is the new Shadow Telos for GWD3?