How can I differentiate between the rectified and fault P67 Motherboards?

I would be buying the MSI P67 A G55 Motherboard by April. I know that the edition name will be changed from B2 to B3, will be there any clearly visible changes in the cover and the motherboard, like change in label or Change in the Code number of the Model, etc. Thank you in advance. I want such details for the above motherboard as well as other sub 160$ motherboards of the P67 chipset.