I got:
$500 = 10,000 RDMs
$1,000 = +15,000 RDMs
$2,500 = +25,000 RDMs
E-mail also stated I that they gave me an Economy Plus subscription, but it's not under my subscriptions
Edit: Did a dummy booking and it's giving me E+ for free, cool! Might actually use UA for a few trips.