The community has been pretty vocal, and vastly united in it's desire to be able to select Deathmatch (or have Deathmatch occur more frequently) when playing battlegrounds. There are a number of ways this could be implemented.
I'm very hopeful we will see this change in subsequent PTS notes this cycle. It really doesn't seem like it would be very difficult to implement, and there is very widespread support for it in the community. Needless to say, I and many, many other players will be very disappointed if this change doesn't occur with update 29.
@ZOS_GinaBruno
“There is nothing either good or bad, but thinking makes it so.”