Its clear comcast Is upgrading user's on their more pricey plans to test newly laid out fiber optics... thats All I can really say.
Just checked mine here, didn't change (its a comcast 6mb im leeching off of) but I did oddly notice the upload is HIGHER then download
-> checked it too, utorrent is maxing my download at 2xxkbps <- and i just uploaded a mp3 at over 500kbps. Too bad xD hey its good news though. soon enough we will have faster interwebz! like europe, etc. Broadband will die :3