At the show, DC told retailers that they have a seven figure marketing budget to spend on the Relaunch, which includes everything from the previously Bleeding Cooled TV ad campaign, including the Cartoon Network ads to USA Today, Facebook, movie theaters ads, conventions and promotional materials. The target audience are men age 18 to 34 though they do realize that they have readers in other demographics.
They also confirmed the Bleeding Cool story, not just that Batman Beyond would continue, with Superman Beyond but also Justice League Beyond.
As to other creators, James Robinson is already working on a new comic project with several issues written, Amanda Conner has a project in the works as does the previously mentioned Nicola Scott. Phil Jiminez and Scott Kolins are also still working for DC.
You won’t be seeing Donna Troy yet in the new DCU, nor the Stephanie and Cassandra Batgirls. They haven’t been killed off though, just benched.