FedBizOps has been retired and replaced by beta.sam.gov. Even though it says "beta", it is currently active for contracting opportunities. Eventually, SAM (System for Award Management) will be integrated and 'beta' will be dropped out of the URL.
According to GSA (General Services Administration), the new system provides better security, data quality, and convenience, will reduce barriers for doing business with the Government, reduce reporting burden, and increase transparency into federal spending. We haven't had sufficient time to use the new system so we cannot attest to the added functionality.
GSA (General Services Administration) has posted a Quick Start guide for using the new system. This guide links to training materials and videos regarding searching and following notices posted by the Government.
Migration is straight-forward. Your login/password credentials from FedBizOps works in the new beta.sam.gov system.