Comcast's advanced cable-box footprint keeps getting bigger. While currently you can only get the X1 set-top box in 18 of its service areas, that's growing, as it's come to several new markets recently. A company spokesperson recently told us that the cable giant is still on track to have the new unit as an option for all of its customers by year's end. As of now, new and current Triple Play subscribers in Nashville and Knoxville, TN; Jacksonville, Sarasota and Naples, FL; Baltimore and Frederick, MD and Brunswick, GA can snag the hardware as a free upgrade with select programming packages. Or, if you're patient, you could wait for the X2.