Right now the main contenders for jewelry are..
-RRoG passive (F+R equipped):- For any build that uses dual sets.
-Convention of Elements (F+R equipped):- Dps boost single set builds.
-Stone of Jordan (F+R equipped):- Same as above
Don't think Unity will be used as much for solo pushes as Blizz said that they will be doing a pass on the hp and damage numbers of all the mobs as they are killing the perma-cc builds.
As for Amulets, double immunity seems to be very popular as it helps with the high end GR fishing.
While we can't do that, Tals and Sunwuko users will at least get an ammy slot free to use a Hellfire or Immunity ammy now.
Also we're just talking about the item combos we know of. We are yet to see the new legendaries, sets and jewels coming in the next patch. Won't be surprised to see 3+ viable builds for each class.