They do have HDMI CEC, so the TV will turn on the POWERNODE and visa-versa. However, the POWERNODE is an integrated amplifier and does not have pre-outs, so if you want to use an external Rotel amp, you'd need something like the NODE, which has pre-outs as well as a 12V trigger out to turn the amp on.
That said, if you already have an AVR, I think you are in good shape. It's the best solution for a TV because it can decode all codecs. The Bluesound products can decode Dolby codecs, but not DTS.