Brought up Buzzr on Pluto TV today for the first time in a while, and I think there's been a nice change to the handling of ad breaks.
Previously, any unsold ad time was filled by that fluffy light elevator-hold music over the "We'll Be Back" animation. But now it looks like the time is filled with various Buzzr program promos (co-branded with Pluto) and generic Pluto promos.