I'd like a compact swimlane view – something like the current "all closed", but with a visual indicator of how many issues are in each column. This could be done with numbers, or, even better, with a highly compressed view of the tickets that only took a few pixels – almost like a stacked column chart, or think "equalizer"[1] – that could then be expanded. This would allow me to get an overall picture of the sprint in a single screen.

[1] http://www.clker.com/cliparts/w/J/f/A/a/W/music-equalizer.svg