In the Army Officer Corps, do Mustangs get promoted faster or differently then regular Officers? What are the typical promotion timelines?

Theoretically, there should be no difference based upon source of commission. You don't see lot of us Mustangs make GO simply because the additional enlisted years mean you are more likely to age out before making GO. If you go to the OCS Hall of Fame at Ft. Benning, they have plenty of pictures of OCS officers who made COL or above.

In a word no. As stated previously it is based on TIG and the needs of the service. Mustangs in my opinion make better officers because they understand both side of the dynamic that we call the rank structure. However being a mustang I may be a little bit biased.

Had a Bn Cdr in Germany, 2/6 IN that considered himself a mustang based solely on the fact that he was enlisted, SSG, before going through OCS for commission. His call-sign was Mustang 6 as the BC. He retired as a LTG, LTG Weisman. Good dude.