Yes, they don't require you to buy all the previous expansions. You just buy the most recent one and all the previous expansions come along with it.

This is a really nice offer, though, even for someone who has most of the stuff already. Even just the two months of gametime is a deal if you think of it as $10 a month. And on top of that they give you all the expansions--including the newest one released only a year ago.

One thing I'm not clear on: I wonder if I could buy that pack, use only the SO key to upgrade my account and still get the 60 days of game time... Or do they require you to create a new account when you buy this package?