Will's still voicing most of their promos as far as I can tell. They just changed the v-o on their ids and sweeps. I think he sounds good. KROQ has a history of doing this, even back in the 90s when John Frost was there producing and voicing the promos... over the years they've had Vic Caroli, Joe Kelly, John Wells, Howard Parker and a host of others... they usually switch that "big voice" every couple of years.
Live 105's change in imaging didn't come when Will left -- he still did a lot of stuff for that station for a while -- but when Sean Demery came in as PD and took the station in a very anti-radio direction.