My predicitions?
The DM screen is likely to be late. A week or two.
I expect a couple minor revisions to the PBR and DMBR PDFs... nothing major, just errata for them. (The PBR has a significantly misplaced table, for example.)
I expect March and September will start the new D&DAL seasons...
Each season, I expect, in order, a campaign sourcebook (with races/subraces, backgrounds, subclasses, monsters, and some setting materials, maybe also a few spells and magic items) the month prior, A Tier I or I-II adventure module to start with, possibly another tier II or I-II the month after, and a Tier III-IV adventure following, all sharing the AL Season's theme.
I halfway expect a rules expansion book in December.