There is no difference (in terms of the UI itself).
The CDs that ship actaully have 2.0.1 or 2.0.2 on them, and we have to repatch up to 2.0.3, so all our mods will still be running just the same as they are now.
Of course, next time a patch is released (2.0.4, to fix the raid tab problems, for example) we may have to fiddle things again, but that's just business as usual and nothing to do with the expansion itself.
And naturally if the mod contains information like spell names or zone names etc it will need to be updated for the new content, if it hasn't already.
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