We don't have any "locks" yet, but we do know that it's a JSA/Golden Age themed wave. And TG had said it will be more like 16/18 than 17, so I'm guessing four figures fitting the theme and two that may not fit as well.
I know I'm echoing an older rumor list here, but I think there's a good chance that we'll see some mix of Jay Garrick, Atom, & Sandman. And if Stripe is the C&C, hopefully Stargirl is in the mix too. That list was partially right about 18 and completely wrong about 20 (since it's said to not be a GL theme wave), so who knows, but since the bulk of the figs will be JSA/GA, it'd be hard for Matty to screw up.