GamersNexus received word from a manufacturer (who wishes to remain anonymous) that AMD's Threadripper processors will ship with an Asetek liquid cooler retention kit.
This means there will be no watercooling bundled with Threadripper, but you do get mounting tools that enable you to fit existing Asetek-made AiO watercooling kits. This includes the NZXT Kraken series, the EVGA CLC series, and Corsair's H100iV2 and H115i.
These coolers will cover the Threadripper die area but will not cover the entire integrated heatspreader (IHS). It won't look pretty but Threadripper's huge IHS means there are no coolers on the market yet that can fully accommodate it:
As discussed in our past coverage, the copper coldplate is sufficiently large to cover the Threadripper die area, though will not make full contact with the IHS. We won't be sure how much this matters until we have the CPU in hand, but Threadripper's spacing between the dies does imply that they will be outside of the central mass of the microfins. We'll test this once we have a CPU. Asetek's copper coldplates are the same size on all of its Gen 4, Gen 4.5, and Gen 5 pumps.