the cd audio of the show was a=made available last year from Concert Live, and now it gets a Blu-ray release (and dvd as well). The listing says 5.1 too.....
Blu-ray:
http://mvdb2b.com/s/EmersonLakePalmer40thAnniversaryReunionConcert/MVD5220BR
DVD:
http://www.amazon.com/Emerson-Lake-Palmer-Anniversary-Reunion/dp/B0052Y0FJ0/ref=reg_hu-rd_add_1_dp
Blu-ray:
http://mvdb2b.com/s/EmersonLakePalmer40thAnniversaryReunionConcert/MVD5220BR
DVD:
http://www.amazon.com/Emerson-Lake-Palmer-Anniversary-Reunion/dp/B0052Y0FJ0/ref=reg_hu-rd_add_1_dp