At least BEYONCÉ's sales + 50%.
With the amount of singles released before-hand (and there will probably be at least one more), the build-up of hype and anticipation since Unapologetic, and the promotion so far, I fully expect #R8 to be able to sell those numbers and more.
At the very least, it should be able to sell more in its first week than BEYONCÉ in its first day.