AMD lists Ryzen 7 2800H apu on its own website
There is a reference to the Ryzen 7 2800H in a footnote on an AMD webpage. That would be a new Raven Ridge apu due out this year. The processor has not yet been officially announced. It is probably an apu for laptops.
AMD mentions the Ryzen 7 2800H in the footnote on a promotion page about the 25×20 initiative. That was set up in 2014 and according to that plan AMD wants to release an APU in 2020 that is 25x more energy efficient than the variants in 2014.
In a graph AMD shows the performance level of ‘Raven Ridge 2018’. It appears from the footnote that this is based on a system with a Ryzen 7 2800H apu. AMD does not yet have such a product in its range. 2017 performance is based on a system with a Ryzen 7 2700U, the same footnote shows. That is a laptop processor and presumably that also applies to the new Ryzen 7 2800H.
The naming also seems to indicate a laptop processor. AMD previously released frugal Ryzen laptop processors with a U in the name, just like Intel does. Intel uses an H in the name of its more powerful laptop CPUs, and AMD seems to want to do the same.
AMD has not yet announced specifications of the Ryzen 7 2800H, but references to the 2800H already appeared in May. There would also be a 2600H. In both cases it would be quadcores with smt. Further details about clock speeds, the integrated Vega GPU and the TDP are not yet available.
Related footnote: AMD Reference Platform, “Raven Ridge 2018” AMD Ryzen™ 7 2800H, 2x8GB DDR4-3200, Samsung VLV2560 SSD, Windows 10 x64 16299.64, Graphics Driver: 23.20.768.0, 1920×1080