I for one do not like this because I believe there is too many entrances into Walt Disney World anyway.
There has ALWAYS been an entrance behind the MK. It sounds like this is basically relocating that northern entrance a few hundred yards west (even if the existing Center Drive remains open to Reams)
Depending on where you're coming from and going within WDW, I think many GPS devices actually route tourists through Center Drive, something Disney is helpless to control. They do need a northern entrance with a bit more capacity, avoiding the speedbumps and CM crosswalks.