No. There is no (practical) way to reveal the WPA keys.
Also, because they change periodically, unless you catch a new client coming online, knowing the seed keys (or the WPA-PSK) will also not reveal the current key. Once the encryption is up, the key changes are handled inside the encrypted channel, so you wouldn't be able to see (or, more accurately, interpret) the key change activity.
Good Luck
Scott
