I rent a home that was foreclosed on what are my rights as a tenant? I signed a lease that ends on October 2012.

As a tenant with an active lease in a residential home that has been foreclosed, you may be able to work out a new lease with the purchaser of the property.  If the new owner is unwilling to enter into a new lease with you, the owner can have you removed form the property by way of a Forcible Entry and Detainer.  If this occurs, you can sue the prior homeowner (with whom you had the lease) for damages for having to relocate.