FreeBSD 11.0 will be supported until 3 months after the release of 11.1. FreeBSD 11.1 is scheduled to be released at the end of July, beginning of August: https://www.freebsd.org/releases/11.1R/schedule.html. You may want to hold-off on 11 until 11.1 is released.
Alternatively, you can upgrade to FreeBSD 10.3 now instead. It will be supported until April 2018.