There's a glowing review in the Dec Hornby magazine ("far and away Dapol's most advanced O Gauge loco yet"), highlighting the fully compensated chassis and superb running. Production version arriving late November so presumably in the shops before Xmas.
Hornby's sample appears to be fitted with a Zimo MX644D with a custom sound and control set, and a pair of clip-in sugar-cube speakers below - these are not factory fitted. So it should be possible to fit a third party sound package for much less than the GBP175 premium that Dapol will charge for a sound fitted version. Hopefully there will be room in the smokebox for a decent stay-alive too although it looks pretty cramped.