This from Film Music Reporter:
Varese Sarabande Records has announced a soundtrack album for HBO’s hit show Game of Thrones. The album includes Ramin Djawadi’s original score from the show. The soundtrack will be released on June 14, 2011. More details on the album will be published next month. It is expected that Djawadi’s main theme will be included on the soundtrack.
I'm a huge movie soundtrack lover, so that's wonderful news!
Here is Ramin Djawadi's main theme: