Rebates are usually send you a check in the mail. I have, however, received a prepaid credit card in the past.
They won't be able to send it to your bank account, because they won't know your bank account, unless you give it to them. You pay Newegg-->get the rebate form from Newegg-->you print your invoice from Newegg, and get the UPC label off your item-->send them into the product manufacturer. It can take quite some time to get your rebate. Sometimes it can be a few months.