Ag Leader has the patented Dawn RFX+ row control module at their disposal, of course, though they have made no announcement to us expressing an intention to use this system at this time. The concept is neither strictly "row by row" or "sectional", but rather allows the user to create arbitrary levels of increasing or decreasing control based on their needs. For instance if you had several rows that were in tire tracks you could add a separate row by row control for those rows without incurring the cost or complexity of a full row by row setup. This module attaches to the existing RFX system and adds onto rather than obsoleting the existing product. The Dawn version of this product incorporates a pressure transducer for high resolution closed loop control. 

http://youtu.be/I2yN07YqWFk