I'd like to have the ability to use the notion of Upcoming sprint in JQL searches.
For instance, I have planned 2 sprints ahead of the current open sprint. I'd like to be able to filter separately the issues planned in upcoming sprints 1 & 2, using the advanced search. I would use this search query to create swimlanes in Kanban boards or create structures within the Structure plugin.
Note that future sprints don't have a date so autocomplete needs to be revisited.