Thanks for the post 7sleeper. Tried to rep you for the info, but you are in my 'rep-holding pattern'.
I asked the local STIHL rep at the State Fair why it takes so long for the newer models to be introduced in the US. Despite all the sniping at US EPA rules, he said that the European rules are stricter in some ways. He said that over there, each saw must meet emissions requirements, while in the US, it is averaged out over the total product line sold.
So if STIHL sells a bunch of low emissions products (including brush trimmers, etc.), they can still sell some of the older, less environmentally friendly saw models. I guess that means if you like the older style saws (260, 361, 440, 460, etc.) buy them while you can. If you like the newer versions, be patient and they should show up on US shelves within a year or so.
Philbert