I heard, but it's only rumours, Lakeside and Crashsite will be in!
Snow likely won't be in. Crash Site *might* be in depending on if the assets get implemented into the core game. Ruud and Yosh need to work that one out.
Otherwise, Lakeside needs a tiny fix to prevent glitching/griefing, the new armor system needs to apply fall damage, mendoza needs a nerf, some vehicles need to apply damage to MCTs, proxies need some slight changes, and vehicles need a slight modification to prevent griefing with the soft level boundaries.
On paper, mendoza has the same dps etc as mobius but in actually game play, mendoza is insane. Not sure if it's the reduced fire rate causing less spread or what but he definitely needs a nerf.
As you can see above, no major show stoppers, but still bugs that need fixing.