the psncontent.blospot.com site has an RSS feed u can subscribe to.
But they haven't updated at all this month...so idk...but it'd be nice if sony did one themselves
reading their latest blog post it says that someone is taking over their blog...so maybe their still in the process of updating...
I wouldn't have a problem with DLC if it came long after a game release. But having $10 worth of content on the marketplace/psn a week or two after release is concerning .