Yep 6.5GB/s coming with the second gen PCIE 4.0 drives. It was mentioned in one of the Tech Tubers Computex videos, may have been Hardware Unboxed.
Hmm.. Interesting if true. Haven't seen any references to such speeds, just those newer drives on the Phison PS5016-E16 controller, which seem to max out at 5GB/s.
And then the "raid" setups like the Aorus AIC Gen4, but that of course that needs 4x2TB SSDs running together in order to reach it's 15GB/s.
Will wait until Samsung get their new stuff out later in the year on different controllers to know for sure, I guess.