Not sure myself on the specifics of "plus" certification. The amp section may very well be more efficient but this has yet to be confirmed with valid test measurements. I guess we'll have to wait and see.
I think that an increase in THD, although likely not to be perceived, is still not a positive especially for a new and improved model. As far as more inputs are concerned, I know that it is claimed that there are now five HDMI inputs but which source are we to believe ? The website claims 3 HDMI inputs the last time I checked.
Also, Cirrus Logic as opposed to Burr-Brown ? That is ridiculous, unless, of course, those facts are wrong.
Regards,