It is April now and BlackBerry is starting to push out security enhancements to the BlackBerry Priv. The April update for BlackBerry Priv weighs in at about 20.9MB. There are currently no available changelogs but we will update again once they are available.
Update: This is the AAE298 build that BlackBerry has been pushing and is purpose-designed for the current CVE-2015-1805 vulnerability.
Update 2: This is the April Security Update and it brings about 25 vulnerability patches with it. This AAE298 build is the same build that BlackBerry has been pushing since 23 March.