On the vids I've seen it's said, or at least implied, that the 30 will be more aggressive than the 20. How much more aggro? Will you be able to pull classic rock tones out of it, or is it totally modern?
Rebel 30 can totally do classic rock tones. I wouldn't call it a particularly "modern" sounding amp at all. Definitely vintage-y tones to be had in there.
Hard to really know until they release it, but my guess it that it will do both. Certainly that is the case with the 4212. That's a totally different amp, but they all have that Egnater "thing." I wouldn't say the 20 is overly "modern" sounding.