Hi. I may be interested in this line as White. What are the plans for white? 

After thinking about it, I think your best bet to steer the game into relatively safe waters is to go for the queenside castling plan. Adams and Anand have used it in some games and have not lost with it (to my knowledge).  It's a fairly simple set up: Be7,Nc6,a6,Be6,Qd7,0-0-0, if a piece (usually knight) lands on g5, you swap it off, then play f6. Then you centralize your rooks on e8 and d8 and swap pieces down the open file. Also sometimes the move h5 comes into play.

In the kinside castling formations, the Rb8,b5 plan is from Rublevsky-Shirov, Sochi 2006. 

Random thoughts: the queen can usually enter the q-side via d7-c6(a4), or occasionally if the d file is sufficiently cluttered or abandoned (so your weak d6 pawn doesn't get picked on), you could open the back door with c6 to get the queen on a5.  I think I saw an old Marshall or Pillsbury game with that idea.

What do you think about 5.c4  and 6.Nc3..., is this an improved 5.Nc3 system? I think that after 5.c4 white has a better control of the center.

Thx

I've played this with white, and I can definitely say that you must get the Bishop to f6.  That's a big deal.  On the whole, I would agree with Inn2's strategy.  Most wins that I've gotten out of this position have come from one or both of the following factors: 1) bad defence of a ...0-0 position, usually including or resulting from risky pawn grabs on the k-side that open lines. 2) insufficiently active Queen and Rook(s). This is what I play against when I don't have a free attack on the king. Usually the white pieces have the chance to be much more active than their counterparts.   

If you can get the black queen to a5 or c6 or b4, you have good chances to cause some disruption, veritcally (vs. a,b pawns) and laterally (defending important central and k-side squares).

Trying too hard to win is definitely a common sin for the white player in this position.  I've eaten dirt several times trying to force things.  I can see how many white players lose on time.  Work out your black defensive setups and blitz away, putting white under the gun.   

As for White, I think the best way to go is to play for the attack as much is allowed, but always have the eagle eye on opportunities to shift the play into a favourable ending.  I remember seeing some high level encounters (I forget which) that featured exactly that.  I was really impressed by that and it made me want to keep playing this line.

I'll post again if I can figure out some of those games that were instructive to me (for white and black).   

Good Luck.

check some Shirov games as Black - especially a nice attacking win - dont ask me to remember it but basically the plan is take on c3, put a bishop on f6, a rook on b8 and push the b-pawn.