Oh, BG3 is not going to happen. If they try, they're going to be eaten alive with D&D licenses, TSR/Wizards/legacy, Forgotten Realms reloads, Spellplague and all that crap. Bioware didn't just refuse to make more Forgotten Realms games for nothing - they decided to create their own franchise so they wouldn't have to deal with fees and their writers wouldn't have to call the license holders every other hour.
Buried in red tape is my prediction. And hope. The child of Bhaal reached level 31 and can happily rest - among gods or among mortals. A hundred years passed, Minsc, Boo and Jaheira are dead, as are Nalia, Valygar, Anomen and many others. Thay rules(sadly, without Edwin), many mages lost their minds during Spellplague, and only Artemis Entreri is on the prowl somewhere.
Also, lyrics aside, do they have money for something DA/D3-worthy, latest graphics and all that stuff, not to mention music fees, voice actors, and writers like Patrick Weekes and David Gaider? No way.