We will be having a community planning meeting on Sunday, August 20 at 1:00 Pacific (4:00 Eastern) to establish the plan for the eleventh Factions arc, which will be between the Freljord and the Shadow Isles. It will take place on Discord.
In the meantime, the #arc-discussion channel on Discord is a good place to talk about your ideas for Arc XI. I’ve also created a forum thread.
Update: Meeting complete! Thanks, all. I’ve written up some notes.