Last December, Comcast had said that they were not switching over to tiered internet plans. Today, Comcast has announced that they're going to be testing out tiered internet plans. While many specifics weren't given, we know that Comcast will be testing two different models in different markets. If you're going to become a test subject, Comcast will notify you before the change. If you aren't a test subject, good news for you: Comcast will be lifting the 250GB data cap while the tests in other areas are going on!
There are two new models that Comcast will be working with. They both have 300GB data caps for basics levels. In the first model, all tiers (probably varying speeds, in this case) will have 300GB caps and you'll be charged $10 for every 50GB you go over. In the second model, different tiers will have different data caps, and you'll be charged $10 for every 50GB you go over those data caps.
This actually doesn't sound that bad. It's not tiered like most people think of it, so far as I can tell. A 300GB bandwidth cap, while still a bandwidth cap, is quite large. And $10 for 50GB, which works out to ~$.002/MB, isn't terrible.