We years away from Sorcery rules at best.
Heroquest framework, probably longer than that
Larger scale, Ritual magic (wyters and up) rules .... hmm, possible, but I doubt it. More likely as a JC publication
A few more settings (Western lands, Eastern Isles, Pamaltea locations) .... only as JC publications (IMO). Several have already been released. Although, you may see something on Western lands with the Sorcery rules.
The big Hero Wars campaign book ... huge undertaking. I can see it being done, but such a huge effort may not financially feasible