Yes, 10 years is a big deal. But no, I don't know how much of a party HCS throw for their games.
Legacy will have an anniversary event, and from what I've heard (without ruining anything or spilling Elder conversation) it'll be a bigger deal then most.
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Now since this is turning into a bash thread already I would like to throw a few points out there.
1 - I think it's clear HCS wanted Zorg, not particularly Legacy. Why do people still expect stuff from them 3 years later?
2 - Legacy is Zorg's baby, why do you think he would let it go to the players who have no plans as to what happens next?
3 - I respect rules, and HCS do have the rule that anyone coding their games has to be within X distance of their office, this makes sense in the case of a meltdown.
However, here's a picture of the blog when Zorg told us HCS were buying Legacy.
I highlighted the part that matters and I think it speaks for itself.