Yea, it's quite staggering.. not even one update, since I purchased my Rigol DG821PRO at Singles day last year (delivered mid december2023)
To be fair, they made it quite clear via the front panel and UI design that they were not serious about this series. 
Never trust a design team which uses fake electroluminescent (?) digits, does not know how to draw a sine wave, and arranges the number pad in a circle...
Seems they finally got the memo and changed the circular number pad on the DG5000 PRO series, though the UI seems to be identical to DG800/900PRO.
https://www.rigol.com/products/DG_detail/DG5000_Pro DG5000PRO seems to be a Sig'gen series that price-wise will be around 4000 to 7000€ here in the west.
To be fair. the circular number pad doesn't bother me, as I don't use it, and likely wouldn't even if it was rectangular, - its so much more convenient to use the number pad on the screen.
The relatively big 7" screen is a huge plus.. do enjoy that, on these modern signal gens that are packed with features and also like the mobility from running it on power banks, but one gotta wonder where Rigol's heads were when they decided to put these hysteric noisy fans in their latest signal gen & scope-lines, not least when it was an area Rigol prioritized on last gen signal gens without the "PRO" where Rigol glorified how they managed to make them passive, and what a joy that would be.