Well, I know its drawing a long bow, but if you look at some of the screenshots that have been posted, you will see variable numbers of animals (pigs, beavers, cows and horses) making up each resource (i.e. in one picture there are 3 horses, in another there are 4 horses). In a video, you see a fur resource made up of 2 beavers.
So, it got me thinking, maybe this is a visual representation of different-sized resources?? Like I said, I'm probably wrong, but it does give some cause for hope.
Yours,
Aussie_Lurker.