Various media, including slides and video recordings, from recent talks about Replicant are available on the Replicant wiki Conferences page, including :
FOSDEM 2016 (slides and video)
Coliberator 2016 (slides)
PSESHSF 2016 (slides and video)
Some of these presentations are great ways to get an overview of the freedom and privacy/security issues associated with mobile devices, either in English or French. They also offer an introduction to Replicant within that context. Other presentations cover specific technical aspects related to liberating devices at the lower levels.