So far no indication Greg Weisman is involved. Heck, he hasn't commented on the news yet on Twitter.
And to be fair, I doubt they're gonna get Greg involved given how every reboot tends to have a different person helming it from the original (Animaniacs 2020, the various Scooby Doo spin offs, DuckTales 2017, Tiny Toons Looniversity, My Little Pony Friendship is Magic, She Ra and the Princesses of Power, Rescue Rangers 2022, Muppet Babies 2018, etc.) so the fact Greg isn't involved with this wouldn't be a surprise.