It's quite obvious unfortunately that they'll offer it regionalized in some countries like Germany, etc.
For the reason of local "gore settings" as already mentioned and maybe also for the reason to attract (mostly younger) players who don't speak english so that they can play it in German.
Imho it'd be best to release it in 1 Version (even localized), and allow the people to:
- set the subtitles in game (equal to the different versions of the D2Lang.dll e.g.)
- make it possible to download language pack(s) from Blizzard homepage which replaces the one that was installed in the version you bought.
Still waiting for a blueish to give some insight on their plans concerning this...