Dave Raymond will be doing play-by-play work on 45 Rangers television broadcasts and 12 Rangers radio broadcasts in 2016, per Barry Horn on Twitter.
Raymond has done quite a bit of minor league and major league play-by-play work, and did work on the Houston Astros radio broadcasts from 2006-12. More recently, he's done work on the Longhorn Network, and has done basketball broadcasts.
There's been talk previously that Tom Grieve would be doing less broadcast work going forward, and the assumption has been that Mark McLemore would take a bigger role -- however, this would seem to indicate that Raymond is going to be doing that, instead.