I haven't noticed a change. Here's a list of the sizes on my last 20 downloads :
xs,xs,m,s,s,m,l,l,m,xl,s,xs,xxxl,s,m,l,m,l,s,m
It's a mixture of all the sizes, although to be honest I don't get many XXXL so that one is a slight anomaly, but other than that it's about the same as ever.