Progress with the KT R1 appears to be happening as some photos of the housing were shared by 'Lei' on Discord.
While progress has been slow I think we'll be hearing more and more about this device as summer moves along. Originally seen as the probable main competitor to the Retroid Pocket 2 from last year, the KT R1 will now also be competing with the RP 2.5 and RP3. Price will definitely be a big factor and we don't have a clear idea of pricing for any of these yet.
I definitely like the form quite a bit if this is what the final product ends up like: