The Hydrosphere Occu popped up on my PoE Discord and definitely looks fun for an off-meta pick and can go far...eventually, a badge and double VB's is hardly league start though so no Ubers out the gate.
Most of the people I play with are going with pretty safe bets though. Poison Seismic/Bane/Venom Gyre/Spark Inq/Explosive Trap/PoCo I think are the main ones I've seen bandied around.
I'll be playing PoB fixer once again for all the people trying to play CoC builds without looking in to how to play them as I'm playing other stuff for a few months. Maybe organise my standard stash a bit, added a couple more fun corrupts from end of league Gambas(Hateforge and another Mageblood).