So maybe "maximum reward" is the amount of BTC we will be awarded in the future, if the pool has a few lucky rounds?
Yes
Isn't it the opposite... the pool had lucky rounds before, and the maximum reward is the amount you get back from the overhead if the current round ends right now?
Edit: I got that backwards. I blame it on just having gotten out of bed with a fever...

Anyway, even though the pool stats won't admit it yet, it seems that a block was produced, and that outstanding EU payments are included:
http://blockexplorer.com/b/134863 (4 confirmations atm)