Reading the link, the $49 sounds like it's just for people who own version 1 to upgrade to version 2, not to upgrade from whatever comes with X3 to Editor.
Yes, this is correct, I believe that was answered in another thread. The upgrade from from Essentials to Editor is still the same as always. I am hoping they offer a special deal to X3 owners at some point, I have wanted the full Editor program for quite a while, its a considerable investment, though.