In the stream it was asked "Will there be subclass rebalancing?" To which there was a swift "Oh yes most definitely." That means either unused subclasses (sun breaker, defender, voidwalker *maybe* blade dancer) will get a buff or the one glaringly dominant subclass (sunsinger) will get a nerf. Knowing bungie and their lack of intelligence or motivation to do anything that takes more than 2 days to complete in the studio, I'm sure they will only touch sunsingers seeing as how it is 1/5 the work for the same effect.