Received 8.2 on my TCL TV tonight. So far, it appears that the DD+, DTS issue has been fixed. I will confirm when I get more sources and formats through it however. Otherwise, everything appears to be the same. I did not have to reset any settings, including picture, so that was a nice touch. I don't really notice any new features, but I wasn't looking either.
Edit: OK. DD+, DTS output from TV is not working properly. In fact, it may be worse. To recreate, connect TV to AVR with HDMI using ARC. Set TV audio out to DD+, DTS. Send any STEREO (two channel) signal (the Pandora music app for example) to the AVR. Set the AVR to output STEREO. What you will hear is what is commonly referred to as the difference signal, or L-R )left minus right). Very odd. The update (8.2) may be worse, because now not only is the signal L-R, but there is a severe "pumping" of the signal.
Now, in order to fix the problem (so you can listen to Pandora in stereo, for example), just change TV output to DD, DTS. Problem goes away. It is not an HDMI cable issue. It is not a Pandora issue. It is not an AVR issue. The fact that everything works as expected in DD, DTS (no +) mode, tells me its a Roku software implementation issue. Oh well, maybe next update.