RE: Exact release date of Riftwatchers Booster Packs?

Good estimate. Unless the team decides to increase the voucher drop a few weeks before they want to get the Riftwatchers out. My guess is they will adapt also a bit to the general sale of CL, but they have all the flexibility needed of shifting the release date. In any case I expect we will hear the updates in the AMA's towards the end of Q1.
Have a slice of !PIZZA