I don't know if this has been mentioned yet, but I noticed there's a new preamp tube type that many (if not all) the models are defaulting to: "Authentic."
I'm curious as to the technical differences between this mode and the four other tube types previously available.
I would assume it's an improvement over the others, but the others were kept in the Axe Fx to appease those who may still want them.
I'm also noticing that on clean settings, the notes don't jump out and stab me in the face from time to time like they used to- better modeling of tube compression, perhaps?
At any rate, this new firmware's improvement definitely isn't placebo effect:
I've caught myself at least 5 or 6 times today forgetting that I updated; and saying to myself, "man, this thing sounds REALLY good today for some reason. Oh, that's right, they just made it better." XD