I would honestly regard this as bigger news than the 5th edition Dungeons & Dragons announcement...
First is the ENWorld article here.
Next is actual press anouncement here.
..aaaand here's the WotC page for the PHB.
I for one am amazed that they are doing this, and actually this really suggests to me that WotC is now officially "thinking outside the box" about what D&D is and who plays it (and who they want as their customers).
SO yeah, I'll be ordering these new prints of AD&D, and I think I see a brand new 1st edition campaign in the near future to enjoy them!