In my opinion, two weapon fighting is going to be much more viable for a ranger or rogue in 4e.  Fighters are, after all, a Defender class, so the class is going to be designed to be a "tank," and two weapon fighting is generally something people want to do damage with.  Of course, if they put some two weapon defense stuff in there, I suppose it could be alright, but I guess we'll see.
				
			 
				 
 
		 
 
		 
 
		

 
 
		 
 
		 
 
		 
 
		 
 
		