Those who aren't aware, this CGI special was meant to arrive in December 2013 in the US, but got pushed. Previews are currently available on YouTube, along with Ringo Starr's music video "I Wish I was a Powerpuff Girl".
I dunno if this is just the special, or if Boomerang will be bring the entire series back to the UK. That'll be confirmed in a few months.
it is currently running on Boomerang in Australia. Here is the show page they've put on their website.