The Telegraph has released an exclusive clip from Horns. Then there's also news you could have missed via Facebook: In the US, Horns is available on demand (pre-theatrical release, also mentioned on Daniel's official Google+ page) plus there's also a soundtrack preview released by Lakeshore Records. And back in July Red Granite Pictures shared the Horns Facebook page with danieljradcliffe.tk on Facebook.
Currently there are two Horns competitions running on Facebook: For the UK there's the "Confess to the Devil" competition, and French fans can win a signed poster.
Update: 15th October 2014. Besides the score by Rob, Lakeshore Records also releases a Horns soundtrack album which features songs by David Bowie, The Pixies, Eels and Marilyn Manson. Find more info on Facebook.