One thing for sure is it offers us a chance to switch around the formation. As many have mentioned numerous times, there are games where we wonder is there a real need to have 2 DMs screening the midfield to protect the defence? It'll allow us to play 442 with a real RM than Kuyt whose at best, better suited to RW instead of sticking with Lucas in 4-2-3-1 all the time. Kuyt can then partner Torres upfront. Rafa could tinker around a bit with 4-4-1-1 too and there are other permutations like left flank as some stated, or even in the AMC role. Eitherway, he'll be a good addition with his adaptability and experience in the final 3rd of the pitch.