In less than a month since the last Mac OS X release (10.6.3), Apple is apparently pushing forward with plans to update Snow Leopard to version 10.6.4. “iPhone in Canada” ( says it has received reports that Apple is preparing to begin testing the next main revision of Snow Leopard.

It’s not known how long this build period will last. However, “if the last period is any indication, the 10.6.4 period could take us into the early summer of 2010,” says “iPhone in Canada.”