The http://www.verizon.com site doesn't say exactly what it is broadcast in, but it does broadcast in HD on some channels.
http://www22.verizon.com/content/fiostv/faqs/faqs.htm#q26
Yes. You can experience the picture quality of HDTV with Verizon FiOS TV if you have a High Definition TV and either the High Definition or the DVR Set Top Box. We currently offer an extensive lineup of local, national and premium HD programming, and we will continue to expand our HD channel lineup as new content becomes available.


