Bad news for Bioware, I think - he's a great writer and it's a pity there'll be none of his characters in Bioware games.
As for Beamdog, I'm not sure - I mean, I'm 146% positive I'll buy any Bioware game, but I'm... not as positive about other companies. Also, whatever they create - if it's not in one of the newest engines, it probably won't last. I mean, it can be Pillars-of-Eternity-good, but even my friends don't recommend that to me in good faith; and almost everyone recommends Dragon Age:Inquisition.
(I've sort of integrated everything planned by David Gaider for Valygar - from the Attic and leftover ToB lines - into my own mods, I think).