Enemies will get faster at making their decisions as Larian has more time to upgrade the AI. The speed at which they think now shouldn't be taken into account when deciding major game design choices.
NOT this. AI is hard, adding more variables makes it harder. This shit isnt easy to code, so I don't know why you would expect it to magically happen.
Oh course it isn't easy and I wouldn't expect it to magically happen overnight. I do however acknowledge how much pride Larian takes in their games and I expect that they will continue to upgrade their AI until they are satisfied with it.
Given the comparison in AI turn speed between DOS and BG, I'd say it's safe to assume that they aren't satisfied yet and we will see great improvements in the AI by the time the game releases.