He is a prospect and he is being brought along very well. You can see the progression of opponents:
He has fought some decent European level guys. He dispatched of former belt holder, Lamon Brewster. He took out Sam Peter.

They need to keep him busy. He needs to fight another fellow prospect like Chisora or Boystov or a young veteran like Arreola.

If he can keep passing the increasing tests put in front of him, then by the end of 2012, he'll be as ready as possible for a Klitschko or Haye. I'd favor the champs in such a matchup but Helenius is an improving fighter and we should know more by the time the fight would take place.

The big mistake most of the guys ranked in the top 10 (and the fringe contenders) is they are sitting and not fighting anyone good. They just sit and wait for the lottery ticket (a big money fight against Wlad, Vitali, or Haye). Only problem with that is they don't continue improving. They aren't sharp. They aren't prepared to really have a chance to win. Then they get drilled. If you want to beat one of the belt holders, you have to really prepare for it. Not sit around and refuse to fight anyone good because you might lose the lottery ticket.