Does Hasbro own the rights to all AD&D games now no matter who they were originally made by...?
If so I would literally have a heart attack if the Gold Box, Eye of the Beholder and Ravenloft games could now come to GOG...
Menzoberranzan and Dungeon Hack and maybe the Buck Rogers Gold Box games for the set...
Please

Gold Box!
Eye of the Beholder!!
Dungeon Hack!!!
ME WANT NOW!!!!

I would have thought that the publisher has rather a lot to do with it too. That's why the Gold Box is so unlikely and Plane Scape remains uncertain, even though all concerned parties are now on GOG.

From what I understand it goes something like this:

Hasbro owns the IP rights to all forms of D&D.
Atari owns the exclusive rights to distribute all forms of computer games based on D&D rules.

Then there are the developers of any particular game. So it looks like it takes permission from all three in order to get the rights to sell/distribute the games. Having BG show up on here is a big accomplishment, and bodes well for other games.

We hope.

Developers have bugger all rights to anything more than money for their efforts. If publishers had the right to distribute this particular IP as they saw fit then that doesn't really explain why Hasbro's involvement was required to bring D&D games here.

Pretty much. Wizards of the Coast acquried TSR whole-cloth after it closed shop in 1995-1996; WotC was subsequently purchased by Hasbro a few years later (I forget which year...1998?) Hasbro has all the ownership rights to D&D and its iterations.

Atari owns the rights to publish computer games of D&D, but not an MMO, which is still under license to Turbine until (iirc) 2015. I think there was some dispute on the Black Isle games, but am guessing that that was all cleared up, if Baldu'rs Gate is now here.

The old Gold Box games (which I would love to see here on GOG) were published by SSI under lisence from TSR. I have no idea who presently owns the properties once held by SSI or where they stand, unfortunately. It would be very cool if they could get them out in a package similar to the Might & Magic or Ishar compilations....

All the D&D games from SSI.

Does this mean all SSI games? As much as I would love to see the SSI D&D games here I'd love it even more if they sold SSI's old strategy games.

That would be awesome. I have many fond memories of the old SSI era wargames.