VideoCardz compiled a list of a bunch of new AMD engineering sample specifications they found. Quite a lot of parts here, with codenames like Whitehaven, Gardenia, Tambourine, Mandolin, Dublin, Munster and Myrtle.
The site has a handy table that explains what the values in the device ID stand for.
Probably the most interesting part in here is Whitehaven, the upcoming high-end desktop chip from AMD. The first two entries show a 1st gen and 2nd gen engineering sample, both models have 16-cores, 32 threads, a 3.1GHz base clock and a 3.6GHz Turbo. The third entry in the table is also part of AMD's upcoming HEDT lineup, this is a 12-core, 24-threaded processor with a 2.7GHz base clock and 3.2GHz Turbo.
These parts are expected to arrive later this year and will compete with the Intel HEDT lineup.
Do note that these are not compatible with the current Ryzen motherboards, they require a different chipset just like Intel's HEDT platform.