The major new architectural feature of this release has been the introduction of the Qubes Management infrastructure, which is based on the popular Salt management software.
In Qubes 3.1, this management stack makes it possible to conveniently control system-wide Qubes configuration using centralized, declarative statements. Declarative is the key word here: it makes creating advanced configurations significantly simpler. (The user or administrator needs only to specify what they want to get, rather than how they want to get it).
Not a jab, just curious.