https://www.equestriadaily.com/2017/02/william-shatner-confirms-role-in-season.html

Well, crikey. ^^ When I heard the rumor, I thought it was just Shatner joking on Twitter, but EQD seems to think this is a sufficiently official announcement. (Shatner has claimed to be a brony in the past, so it's not that far-fetched). Many folks are expecting that we're finally going to hear the voice of Star Swirl (a role which Robert Picardo once said he'd like to do), although there are no details yet.

Well, one note for Kirk on his journey to Equestria: "Beware Romulans bearing gifts." :)