George If you are so interested, then the road looks like this:
ypkg3, gnome 40 (Spring) > ferryd, kde plasma 5.22 (summer) > sol, kde plasma 5.23 (early fall) > updated installer, Software Center, Budgie 11, Solus ISO OEM (To Be Determined)
This does not reflect any official or unofficial roadmaps or priorities.
GNOME and KDE stack upgrades are contingent on (1) when they are released and (2) when they are stable enough to update to. We have a rough idea of when (1) will happen after the last time (2) happened, but we can't plan until the .0 is released, giving us an idea when .1 will be out and if we need to wait to .2, which can vary quite a bit.
As far as my development projects go, that largely depends on the time I have available and what the highest priority is at the moment. ferryd is a higher priority than ypkg3, but I don't have enough time at the moment to give it the multiple consecutive days of my attention it needs. So instead, I'm focusing on ypkg3 development which I can easily work on in short bursts and which happens to have overlap with some of ferryd and sol's needs. Unless I am able to work on Solus full-time this year, I would not anticipate that sol will get finished by the end of the year. The installer is going to need some love sooner rather than later, as well. Everything else is much lower priority at the moment.