Just came across this on SupBeam's website, looks like they're upgrading the 4xXM-L X60 to 4xMT-G2 and now it's 10,000 lumens instead of 5,000 lumens, wow!
If Vinh (vinhnguyen54) can squeeze nearly 7,000 lumens from the 2xMT-G2 NiWalker MM15 then I bet he can squeeze 14,000 lumens from this hoss!