I don't know this. Sounds like a bit of fan fiction. This might end up being true, and I'm pretty sure something else is coming on Sennheiser's horizon beyond the HD820, but I have no idea what it will be. Rumours don't necessarily equal reality.We all know that Sennheiser will release a baby HE-1 in the future, there are a lot of rumors about it.
It's wiser for HFM to release the baby Shangri-La before Sennheiser, so people can say things like the one you said to defend it.
With regards to Stax SR009, the Susvara is better sounding already. The SR009 lacks weight and soul in the instruments, especially in the bass. I've listened on ideal equipment in an ideal listening environment (quiet room, $100,000 MSB Select). The HD800 also doesn't have the bass rumble of the Susvara (love HD800, by the way). No way that the HD600 comes close to the Susvara, I did the comparison in my review of the Susvara.
I'm eager to hear the baby Shangri-La. This is partly because I've yet to be substantially impressed by the Shangri-La (in show settings) over the sound that the Susvara can already generate. I'm hoping I get an opportunity to compare Shangri-La and Susvara in a proper listening environment. I've listened to the HE-1 in a quiet proper listening environment.
I've let several non-audiophile friends listen to the Susvara, two got tears in their eyes. One of them got back to back comparisons to the Utopia, which I now have in house. The Susvara is superior. I don't know what the Shangri-La Jr. can do except remove some costs: no need to replace underperforming stock cable, no need for multi-thousand dollar amplifier, probably still need a DAC as I don't recall the Shangri-La having one built in.
I'm hoping HiFiMAN agree to do an upcoming show in Britain I'm helping organise. Then I'll finally get my opportunity.