With the delivery of MySQL 5.1 GA, our release policy sees a couple of changes in relation to that of MySQL 5.0.
First, initially we will deliver both MySQL Enterprise Server and MySQL Community Server in parallel. The bug fixes to the initial MySQL 5.1 GA releases will thus be delivered also in binary form for both MySQL Community Server and MySQL Enterprise Server.
Second, after a period of time, we will revert to the different release schedule for MySQL Enterprise Server and MySQL Community Server that we have been using. MySQL Enterprise Server will have more frequent binary releases. However, at this point, we do not have an exact date or a release number, when the first Enterprise only release will happen.
Third, we have done away with odd and even numbering. Whenever MySQL Community Server is released, it will carry the same release number as the corresponding MySQL Enterprise Server.
Fourth, MySQL Enterprise Server comes in more flavours than the MySQL Community Server. This will allow us to offer different optional pricing levels for our commercial subscriptions -- where a customer will only have to pay extra for MySQL Enterprise support if he/she plans to use the higher-level features. Hence, MySQL Enterprise Server "Advanced" includes support for partitioning. However, do note that the MySQL Community Server provides the full partitioning functionality.