DTS-HD MA has a variable bitrate, so a single bitrate is impossible to determine. MC detects the core bitrate and displays that. Not my favourite thing either, bu apparently if it says 48000 Hz, it's decoding the lossless DTS-HD MA. Also, there's no plain DTS 7.1, so if you see 7.1 being decoded, you know you have lossless.
You're not the first to ask these questions, so searching the forum may have helped you.
