According to TVGuide UK, 3 new Be Cool, Scooby-Doo! episodes will finally be premiering on Boomerang UK for the Halloween season. On Saturday, October 21, the two-part finale, "Professor Huh? Part 1 and 6 3/4" will air on the network at 8:30 - 9:30am, with a repeat airing at 3:30 - 4:30pm, and "Halloween" will air the very next day, on Sunday, October 22 at 8:30 - 9:00am, with another repeat at 3:30 - 4:00pm.
As of currently, here is still no scheduled air date for the 16th through 24th episodes ("American Goth" - "Pizza O'Possum's" / "The Curse of Half-Beard's Booty") of BCSD. However, the moderator who posted the first 14 episodes on ShareMania, has mentioned that they saw an ad that new episodes would begin November 1 in the UK, so presumably the rest of the episodes (other than the missing episode 24, which I'm not sure when it will air) will aired then. Thanks Dfrazzer for the info!