It was assumed this would be the name of AMD's SMT but now the rumor mill claims it's the name of AMD's upcoming high-end desktop processors. An announcement from AMD is expected at Computex towards the end of May or early June, with retail availability expected in the second half of June.
Reddit user Manintheamazon provides a brief overview of the new information from Donanim Haber. As always, take this with a grain of salt.
Zen HEDT CPU's are called Threadripper! Each CPU will include 64 PCI-E Lanes! It includes 4 CCX's. Lower SKU(Probably 12/24) 140W TDP, Higher SKU (Probably 16/32) 180W TDP. Socket will be an SP3 LGA Platform's name will probably be X399 Chips will be B2 revisions. 32MB L3 Cache ES's are 3.3 or 3.4GHz base and 3.7GHz Boost It is aimed for Retail SKU to have 3.6GHz Base/4GHz Boost ES's that are in the wild have 2500 CB R15. Infinity Fabric can have a bandwidth up to 100GB/s Announcement; COMPUTEX at Taiwan, sales will start after 2-3 weeks following COMPUTEX.