According to the Inquirer, Comcast will be releasing a 100Mbps service "any day now." But it will be super expensive.
Right now, Comcast's top tier plan allows 50Mbps downloading for $189/month. Theoretically, as great as 100Mbps would be, it would run $380/month (no, the price probably won't scale that way). Still, if $380 were the price and you download a lot of movies and stuff, you just might break even. Let's see...if a DVD is $15, that's 25 pirated movies to reach your subscription price. And on 100Mbps, that's downright doable. In, like, an hour.