Iron/Iron(III) Concentration Cell
This all looks correct.  It's worth noting that the voltage generated by this cell occurs through the flow of electrons from half cell A to half cell B as the system reaches equilibrium.  It's also worth noting that the final concentrations of ions should eventually become nearly identical given enough time and free interaction between the two half cells (at which point the voltage becomes 0).

For further reading, this site has some good examples:
http://chemwiki.ucdavis.edu/Core/Analytical_Chemistry/Electrochemistry/Voltaic_Cells/Electrochemical_Cells_under_Nonstandard_Conditions/Concentration_Cell

While wikipedia has a (brief) overview of the theory:
https://en.wikipedia.org/wiki/Concentration_cell