Pretty sure this means BG4 is already in the pipeline. (They also said there wont be any DLCs)
One reason why I prefer BG1 over BG2 (while BG2 is objectivly a better game) is the sense of scope. In BG1 they capture that "leaving the Shire for the first time" vibe that is lost the more (literal) experience you get. So for me this isnt bad news at all, it just means we'll get more games in the future.