It looks like they are giving a 300 GB monthly allowance before the extra charges kick in. Since only the initial download of the bitcoin block-chain requires a ~50 GB download, I don't think this will impact Bitcoin users too much. The month to month additions to the block-chain only amount to around 1-2 GB a month, so this will only be a small fraction of the monthly allowance.
The quote at the end of the article probably sums it up best:
And to put this all in perspective, our national median customer data use is 40 GB per month and 92 percent of our customers dont consume more than 300 GB of data in a month.
It seems like this will be a non-issue for most people, and even for those consuming more than 300 GB, it will only cost them an extra $10-$30/month.
only cost them $10-$30 extra? that's a lot considering home internet connections on average cost around $30-$40. 300gb per month is really nothing.