@omegapirate: It seemed like they were just going by SKU. The rep specifically said "You order Playstation 4 Launch Day Edition. We don't currently have that in stock. You can signup to notified by e-mail when we have it avilable"
@rhaknar: For me, it's because I don't have the option to have it replaced. Amazon told me that they were only able to issue me a refund. Then about two hours later they were listing $500 bundles as in-stock and selling them. I feel pretty screwed over because I pre-ordered one as soon as they let you on Amazon and now I have a dead piece of hardware and limited recourse if I want to actually end up with a working PS4.
This isn't something that gets made overnight. I think it's just more that Comcast is trying to offer something that has a feature set more similar to services like Hulu, Netflix, etc. that people are canceling their Comcast service and using.