I think it'll be awhile because PSA is currently developing a dac that exceeds DS Sr, they call it TSS. You can read about it on the PSA forums at the PSA site. Development is taking longer than expected. Was supposed to be done 2018 I think and still working on it. Not sure when expected to complete, I don't follow very closely. But I believe I remember reading that DS Jr won't happen until after the TSS is finished. So probably not any time soon ....
I think the two big projects they're working on are TSS dac and also a new speaker. Both have been long term projects.
They're also set to release soon a new integrated amp and a streamer.