I wasn't asked for any IDs at all during my oath ceremony besides the PR card. They just took my PR card and that was it..
DL + a credit card or a bank card should do it, but I would also bring a hydro bill under your name and address, cell phone bill etc. Your current passport as Canadiandesi2006 said. As long as you can you prove that you is you, I don't think you'll have any problems.
Good luck!!