An update from CoinGateway:
Coingateway has about 40 tickets in-process for payments.
Once those are done, they will do the 10% payouts.
This is likely (but not certain) to happen at around 21:00GMT (5pm EST).
So they'll automatically issue the payouts for those who purchased with the participating altcoins or will there be a kind of claims process?
Submit a ticket, on a principle of best practice.
It'll ensure that there's zero chance your purchase will end up falling through the cracks.