We’re two mythics behind (I guess three as of this morning) and they have been releasing about one per month for the last few months (Draak was November 11, Abby was December 20 and Gard’s was January 20). I’m expecting Wulfgarok to be released this month (maybe on the 17th or so?) and would expect Pharos-Ra to be the next one. At the current pace, that would be mid-March, but schedules might change once the 2.2 update is released. For us to catch up to PC/Mobile, they will eventually need to accelerate the pace of mythic releases. Pharos-Ra is a 2.2 troop, so the update has to happen before he can be released to us.
For the stones, Arcane Spirits will be available with Night Hag (Darkstone event) - probably 4-5 weeks from now. Arcane Skulls are available now with Mimic and will come up again after the 2.2 update with Rock Spirit (can’t begin to guess when that will be available). You can see troops released on PC/Mobile that are not yet released on console here: