Our website says 445 and 446 are scheduled to release in February. This just in: it's March, which is one month after February. These exams (which add up to the MCITP: Business Intelligence certification for SQL Server 2005) are actually live now... we are updating the prep gudies at the languorous, leisurely pace* for which we are famous.
* I'm just kidding, it is actually the opposite: our page updates are sometimes delayed because of how much content is constantly being thrown at our MSCOM web production team. They barely go home at night.