Hello again, Tattiebogle guy here, apologies for the lack of updates - for the actual "register for interest" I didn't want to spam people so I've not been planning to e-mail anyone on that list except for one time, when the shop is restocked. Which I do realise is a bit frustrating, some people have filled it in three or four times.
I do generally reply to messages that come in from my webform but sometimes I miss those as they end up in my junk folder (recaptcha does nothing!) so apologies.
Really what's going on is I started a redesign during the chip shortage to try and work around that (and reduce the cost), but it came and went and chips are somewhat more available so now I'm just trying to finish off the redesign anyway, with a bunch of time away for family/work/etc. Basically the new version has things people (including here) have been asking for, like SPDIF output (and an I2S header, if that's your cup of tea. There's also a mono 8 ohm speaker connector since the DAC has that so why not), some build in LEDs and buttons so it can have some default "interactivity" even when just mounted in a case, but also a header for a rotary encoder and a 128x32 OLED like you can buy from Aliexpress for $1.
The software is mostly working so they're actually at the factory arriving around Christmas, but I'm still working on the last few bugs and finishing off features (like the menu using the OLED and the rotary encoder) so I'm hoping mid-January.