Google has successfully integrated the radio Ads with adwords, it is in beta phase accords to the adword's official blog. This going to add a new dimension to advertising using adwords. for more information check information http://adwords.blogspot.com/
I think they are looking to become a full service advertising company...they bought a large block of advertising from a newspaper here in new york....they can now offer advertisers a more complete advertising package...online..print...radio...is tv next?
Google is not moving to radio but also for video search and think it will be successful from what i read from Google scholar paper. Yes Video Search is more complicated than other search. Its good you got internship can u just help me out if i have some queries and i would also like to know more on what project you are working related search and latest technology in google.