The book "Extended Abstracts Fall 2012" presents a collection of seventeen extended conference abstracts that emerged from selected talks held during the CRM research program "Automorphisms of Free Groups: Algorithms, Geometry and Dynamics." This event took place in the fall of 2012 at the Centre de Recerca Matemàtica in Barcelona. The included articles are typically short contributions that present preliminary results not yet published in regular academic journals. The works are the result of direct collaboration among active researchers in this field and reflect the dynamic and productive atmosphere of the conference. The book is aimed at established researchers in group theory as well as graduate students who wish to learn about the latest advancements in this active research area.