There is a 'Priority' label in the labels tab. I haven't personally used it so I can't confirm that it works as expected (my new email count is at 0), but it's there.
EDIT: Got a priority email after posting this. It didn't appear in the 'Priority' label window. womp womp.
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This looks great, but apparently no Priority Inbox integration yet:
http://getsatisfaction.com/sparrow/topics/gmail_priority_inb...
I love the increased signal-to-noise that Priority Inbox provides, and I'd miss it in a client that just shows my regular inbox.
There is a 'Priority' label in the labels tab. I haven't personally used it so I can't confirm that it works as expected (my new email count is at 0), but it's there.
EDIT: Got a priority email after posting this. It didn't appear in the 'Priority' label window. womp womp.
That label must be a custom one, since I don't see one in my copy of Sparrow. I'd love to hear if I'm the only one or how I can access this...
Having an easy way to get to the Priority Inbox is the only thing holding me back from using it regularly. Right now I'm sticking with Mailplane.