Many foreclosure sales are scheduled, and are adjourned several times before they take place. Perhaps the landlord is working on a loan mod, or has filed a bankruptcy, or has a forebearance plan. Keep an eye on the newspaper and/or ASK the landlord. Check online. Either way, you have an obligation to pay your rent to the landlord until you are notified by the bank that the landlord no longer owns it and your rent is due and payable to them. And you will be notified, shortly after.
Contact your landlord, Look through the newspaper (online or offline), etc. There has to be some notification to the home owner, which is usually a notice placed on the front door of the home. Notification has to be placed in a local paper as well.
Also, where did you hear the house was being auctioned? Was it a reliable source (meaning, newspaper, goverment worker, etc)?
Cathi how did you hear? if you got a notice than call the auctioneer. You should also call your landlord at once as well. You can also search the legal notices as most states require teh auction to be listed once a week for 3 consecutive weeks on the local newspapers legal notices.