I believe airline routes have to be bid for so once bids make it through they are posted somewhere online.
Here is a Delta news website, maybe the other airlines have similar
Delta Air Lines Newsroom - NEWSROOM

in ddagencylv's signature it shows global aviation news, punched that into google and came up with Aviation News | Aviation Industry & Airline Statistics | flightglobal.com with lots of aviation news.

Here is information on new American Airline routes
American Airlines launching new service from Miami to Texas, Utah, K.C. | The Miami Herald

new Frontier routes IAH-SFO
http://www.usatoday.com/story/todayi...ight/16146767/

So, if you know where to look, as ddagencylv surely does, then you can post here to let us all know.