This means something quite important: Cathars remains a completely separate expansion, now. It gets included as a separate expansion in all official circles. Siege? Well, Siege is a reprint of Cathars, albeit with different artwork, so it still doesn't count when I count "official" expansions for my scenarios. Anyway, wow! What a realization.
Interestingly the fact that they are different causes a new dilemma when I want to play with both belagerers and cathars/ siege- the cathar tiles look nicer, but the siege tiles match the belagerer tiles better...