DattoDoesDestiny has a new analysis video, and this one is covering the Sunsinger (Warlock subclass) in great detail. He goes over every skill and talent and discuss what talents will be the best (and worst) in each aspect of the game.
The Defender Titan analysis video will premiere on August 15th and the Bladedancer Hunter to follow on August 18th. Then, either on the 19th or 20th, he will have a PvE comparison video between every subclass in the game and talk about builds, strike compositions and raid compositions.
For more subclass guides, check out this article.