Gryphon's brand ambassador Rune says the 333 will have more in Class A, how much more isn't clear yet. - so will it run hotter as it already runs pretty warm?
Also he said there's new transistors, the Sankens in the 300 have a warmish character (see Rega's Aethos) hopefully the new ones won't change the tonal character of the amp because I agree the 300 imparts a bit of gravy that makes poor turkey recordings palatable.
Regardless, curious how much better the 333 would have to be to get 300 owners to upgrade, how about you?