BlackBerry just made my day with the latest find in the OS 10.2.1 leak. They have added a pinching gesture to the hub that lets you perform a quick filter action. There are quite a few options including priority, unread, flagged, draft, meeting invites, sent messages, and level one messages. For me this means I can just perform a quick pinch and view only my unread messages which is HUGE.
I used to have a keyboard shortcut (alt+U) to view my unread messages on BlackBerry 7.1 but on BlackBerry 10 I had to fiddle with the search options every time. I am still hoping BlackBerry adds saved keyboard shortcut searches to BlackBerry 10 but until then this is awesome!