He is going for the jugular with his new blog, aiming for such, oh, regular niches such as Health, Finance and Relationships, you know, the most profitable niches out there! He also says he is looking at product creation (get away!), so it should be obvious how he is planning to leverage the runaway success of his ProBlogger/Digital Photography empire, and I don't doubt he is going to clean up!
I say all credit to the man, I've got LOADS of respect for him, he is one of the most straight-up guys out there. Frankly, those niches could do with some integrity inserted into them. What do you think, should the gurus be shaking in their shoes?