I think in the meantime a strong US bundle would do the job as well. They are trying new bundles in UK so I woudn't be surprised if we get something new in the next months in the US...
The bundles I would kill for right now is the following :
Lord of the Ring Blue Ray extended edition with a PS3.
It ain't gonna happen though as Lord of the Ring wasn't distributed and produced by Sony and a Lord of the Ring Blue Ray woudn't need a bundle to sell well.
I doubt we will see any GTA4 bundle either as that franchise doesn't need a bundle to sell well ( bundle would sell more consoles but not more GTA4).
It's more efficient to bundle software whose sales you want to push, especially when pushing a new franchise like was the case with Motorstorm ( or pushing sales of old titles first party/second party titles) like they are doing in UK right now..
A MGS4 bundle is a possibility, it's a huge franchise but not GTA huge so a bundle would help software sales a little and it's a case where Sony might want to give some kickback to Konami........