Looks like the A100-TPS is the 40th Anniversary dap. It's available in a bundle with that case that looks like the original Walkman complete with a window so you can see the cassette screen saver. It also has a 40th Anniversary Walkman logo on the rear. It costs EUR90 more than the basic A106.
Initially I thought the A100 was a more interesting DAP than the ZX500. It is much cheaper, smaller and lighter but has the same screen, same Android (presumably with same EU volume cap issue), similar lousy battery life and costs EUR349. It is however single-ended only unlike all the competition and has even more anaemic power output than the ZX500. It does not appear to have any redeeming features to make up for the single-ended nature, low power and small battery. Then again if it's main competition is the Hiby R5, the latter is bigger, heavier and has even worse battery life but at least it's powerful and can do balanced output. Hmmm. If I wanted a small, light but still useful Android tablet that also sounds good, I might consider the A100. For pure DAP duties, M0 is still the value king.
A100 doesn't seem to have set the forum alight. No thread yet.
https://www.sony.de/electronics/walkman/nw-a100-series