Check Out MC screenshots in Windows 8
Looks like MediaCenter is still going to be included inside of Windows 8. Based off the screen shots nothing really has changes but the version number is different. This is a good sign with Microsoft still going to support it at this point.
Nothing looks to have changed with the UI yet, apart from the version number, but these pictures appear to confirm that at least Media Center is still present in this early Windows 8 build, which is good news.