Bitspower is teaming with FSP to show off a watercooled modular PSU, something they're calling the Hydro PTM+, which is the world's first mass-produced liquid cooled PSU with 80 Plus Platinum certification.
The upcoming Hydro PTM+ is a 1200W unit when aircooled, but is capable of 1400W when the liquid cooling is set up. If the PSU load is less than 50% the fans will stop spinning, so unless you're pushing 1200W of continuous use, the watercooled side of things is kinda useless. In order to draw 1200W+ you're going to need to be doing some seriously hardcore... something... with your PC. Even multi-GPU rigs with GTX 1080 Ti or TITAN X in SLI would use much less than 1000W, let alone over 1200W to warrant the liquid cooling push to 1400W.
Still it's an impressive feat to see a watercooled PSU, even if it's just one of those 'just cos' things.