Rumour
I think this is probably the biggest problem with this forum. Too many people are moaning about stuff that is totally unconfirmed.
Yeah except correct me if am a wrong but people who have retail have confirmed there is no DX11 in the box, pictures seem to show the settings all look basically the same (which is just as they were in the MP and pretty well identical to the consoles) and there are no advanced options. DX11 being released within a few days however, that is a rumor.
And tessellation? I never heard anything from official sources to suggest thats a realistic possibility.