In response to customer feedback, SQL Server team has revised the mechanism to deliver hotfixes on reported bugs with a new model called Incremental Servicing Model (ISM). The objective is to deliver high quality fixes within an acceptable amount of time and on a predictable schedule.

We have moved away from current “priority driven” hotfix release model to a scheduled delivery model in which a customer can get a hotfix to service their most critical situations with a short turn-around time or a fix that has undergone higher levels of testing is released on a scheduled basis.