Nobre certainly has as high a profile as any other Brazilian composer today. I recently came across the Marlos Nobre Channel on YouTube (thanks once again to the Audições Brasileiras blog!). There are many orchestral, chamber music, and instrumental videos to watch there. Together they'll give you a good idea of Nobre's styles, though you'll also want to check out his large, and growing, discography.
Audiences in the U.S. will have a chance to hear a new work of Nobre's during the upcoming tour of the Orquestra de São Paulo, when Evelyn Glennie performs the Percussion Concerto she commissioned from Nobre.
I'll leave you with one of my favourite Nobre pieces, the Concertante do Imaginário,from YouTube: