Frickin sweet.
Perforce is a necessary evil in games. Git is simply not suitable. So this is already a huge win.
I main that Git is - at absolute best - simply mediocre. It's not a "good" VCS tool. It is merely adequate.
I would love to see Epic go for a full Git killer.
It looks like Epic has a created a virtual file system interface that is cross-platform. FRICKIN SWEET. This is a critical component to making a VCS tool that doesn't suck. And there has not been an existing open source solution to it.