No pre-purchase, just a pre-order. However in my country, you don't get any perks such as being able to download the launcher earlier (I read that you can only download/update the launcher before the launch date if you had a pre-order/purchase).
Anyway - after finishing the installation - looks like there's a BIG ASS HELL PATCH waiting. My internet is somewhat so-so (WoW and other online games are playable, not laggy in the least bit), but DOWNLOADS ARE BRUTALLY SUCKTASTIC.
So, how big is the patch download (after disc installation)?