Courtesy of TFW2005.com, via Kapow Toys, MP-09 Rodimus Prime will receive a second release in September of this year to coincide with the release of the new MP-10 Optimus Prime figure.

Informed speculation suggests that:
New parts are made to replace the weak spots, especially with the legs (panels and feet).
Overall quality is the same.
Any improvements I would imagine to be very welcomed, even if they are only aimed at the worst affected areas of note, will just have to wait and see though I guess.