I'm all for this. I get a nice promo and 4 FBL packs for the same price as one of those Jumbo-GX boxes with the increasingly weird assortments of packs. I'll take this over those any day, and since I haven't been to a prerelease in over 2 years this is good news for me.
It's possible, but who's to say they won't fix the rates in comparison to the actual pre-release boxes? I think that even though they'll be the same product essentially, this new line of product will lack the crazy pull rates pre-release boxes have.