Honestly, this should not be released in the first place as many people have no access to the last DLC, but besides the point, the devs better be positive this will work on the PS3 now that a release date is set. If not, I and a lot of other PS3 owners will without a doubt stop playing the game entirely. Sony must be hurting because of you, releasing it on Xbox pisses everyone off, but basically saying Dawnguard isn't coming to PS3 because you can't fix a problem? No way should that happen with this.
I agree, if you can't get Dawnguard (Read an article you can't) I feel sorry for you.
But i doubt this Will Happen with Hearthfire.
Either way, You are not getting it Sept 4. 30 days after at the Minimum