Quote from the Help page:
How are wiki points handled now?
We now calculate your wiki score across all of our sites but still store your site score individually. All editing privileges are now tied to the overall wiki score. That means if you have 1000 points on Comic Vine you can now make live edits on Giant Bomb and Vice Versa.
Not so. I have live edits here but apparently not at Giant Bomb. I assume that's a bug?