The Panasonic DMP-BD10/DB10A does NOT do DTS-HD Master audio, the Sigma chipset used in that and many other early BD players does not have the horsepower according to Sigma themselves to handle MA. It does do DTS-HD High Resolution, however there aren't many discs with HR on them. ... Three of the latter are on their way this year so far, the Panasonic DMP-BD50, the Denon DVD-3800BD or the Marantz BD8002. All will decode all HD audio, are at least profile 1.1 compliant and all are supposed to have 7.1 analogue audio outs.
Re HD Master: I was wrong about this -- I misread the Panasonic site. The BD10A only does DTS HR, not DTS MA. That's too bad, but if the replacement carries 7.1 forward, I guess it won't matter.
Re new BD players with 7.1: that's great news!