Oh you can see them right in the bottom right of the ptr, next to the unit comp display. When a Ally uses a prestige talent, it lists it and lets you read it, while yours is shown as well and in the title screen. (Etc: Changing Raynor’s talent from Renegade commander[Stock] to Backwater Renegade [+100% bio life, -Mules], changes his title screen as well. ]