Amazon has put together a nice links page to update your HD-DVD and BluRay players. If you don't already know, many machines require firmware updates to be able to play the latest discs, particularly the recordable discs, such as BluRay BD-R discs.
If your machine won't play that latest HD disc, check to see if there's an update for your machine.
http://www.amazon.com/gp/feature.html/ref=amb_link_6251772_2?ie=UTF8&docId=1000192641&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=special-node-offers-2&pf_rd_r=1Z4X3ZCR0NACN0A0T70Q&pf_rd_t=201&pf_rd_p=360005701&pf_rd_i=B000Y5JFNY