No. You can continue to report directly through your SPLA Essentials agreement until it expires. Account management and reporting must be done through the Microsoft Order Entry Tool (MOET). You must have a MOET account, which you can acquire with a Windows Live ID.
You can find a short tutorial on how to use MOET in the SPLA section of the Microsoft Partner Network licensing page.
Once your agreement expires and you want to sign a new SPLA, you must work with a designated SPLA reseller.