Changes are of quite varying magnitudes in the 20+ categories we watch closely. Our sites look pretty stable so far, but lots of activity swirling around us.
Looks to me as though authority sites are playing a bigger role, insofar as they have popped up a bit here and there, and are also helping the sites that they link to. May be true of hub sites as well.
A related guess is that those nofollow tags could conceiveably already be playing a role here, such that the balance has shifted away from sites that benefitted greatly by weak and/or dubious inbounds. (However, not sure that those tags could have an effect so fast.)