Not ten years of films, just whatever they've already got cast / in the pipeline. I assume they've got the major players cast already for the new universe? Hell, just Batman and Blue Beetle showing up in the new 'verse created by Flash's meddling. Anything they could cram into a post-credits scene that'd make sense.
These people are paid millions of dollars, I'm certain they could have added something to connect the Snyder DCU and Gunn DCU rather than just letting the current verse be a lame duck session.
Imagine if Marvel recast their entire lineup for future movies and didn't use their current multiverse storyline as an opportunity to set it up in some way.
Chukzombi
Oh, they haven't cast anybody? Well, bleh then. So they're keeping the one guy who is a walking dumpster fire?