Here in north central Iowa, last year we had a lot of extra corn acres, many guys did corn on corn for the first time in quite a while.  I would say a good portion of that will be back to beans, probably 10-20% over last year's bean acreage (maybe more). 

Travelling back to north central Ohio (where my other farm is), there is a lot more wheat planted there than there has been in years past.  Up at least 20%.  From talking to some friends there, there will be a lot more beans than corn in that area, maybe 20% or more from last year's acreage.

HTH,

Mike