A simple prioritization calculation on each card would be very flexible. If it can support a prioritization method like Weighted Shortest Job First, i twoul dsuit the needs of most.

** Make sure you can sort by priority with conditions such as release, label(color)

This would be awesome. Some of our releases can get a little bigger, it would be nice to know what we've decided to prioritize.

I guess that's what the bug-tracking integrations are for?