According to DSLreports.com…
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Comcast will be shaking up their speed tiers as they deploy DOCSIS 3.0 upgrades…
…”Performance” 6Mbps/1Mbps subscribers will be upgraded to 12Mbps/2Mbps ($42.95). “Performance Plus” 8Mbps/2Mbps subscribers will be increased to Blast 16Mbps/2Mbps ($52.95). Both upgrades are at no cost. Comcast will continue to offer an “Economy” 768kbps/384kbps tier for $24.95, aimed primarily at light users and used as a retention tool.
…the company plans to offer a new “Ultra” 22Mbps/5Mbps tier for $62.95. Ultra should hit speeds of about 30Mbps when Comcast’s Powerboost technology kicks in. The grand daddy of all Comcast tiers will be the “Extreme 50” 50Mbps/10Mbps tier, which some markets will see as low as $139.95. Both new tiers will obviously require new DOCSIS 3.0 modems that won’t be available initially at retail, but can be rented for $3 a month.