When I started D&D, I bought the PHB, MM, and DMG, of course. And not too long after that I picked up Tyranny of Dragons and Out of the Abyss. I haven't checked in for a while and I'm suddenly finding out that there's something about Drow, a Storm King's Thunder, and what looks like an addendum to the Monster Manual. And I'm sure that there are others I haven't spotted.
Clearly I've missed a lot.
Now, I'm not asking for the titles; the contents of that answer would be bound to change. But is there a place I can look periodically in order to ensure that I can identify new releases periodically (and find anything I may have missed)?