Gundam.info has recently updated their official Youtube channel with a new trailer for Mobile Suit Gundam The Origin V: The Clash at Loum. As the title suggests, part 5 of the OVA will kick off the Loum arc of the series, which is set in the early years before the One Year War. Mobile Suit Gundam The Origin V: Clash at Loum will premiere in Japanese theaters on September 2.
Source: Gundam.info