What is gear 5 luffy?

As an AI language model, I don't have access to the future releases or spoilers of anime/manga series. As of now, there is no official information on Gear 5 Luffy from the manga or anime. However, it's worth noting that Luffy has advanced through different gears of his Devil Fruit power, which allow him to increase his strength, speed, and agility. The latest form introduced in the series is Gear 4, which was first introduced in the Dressrosa arc. It's unsure if there will be a Gear 5 in the future.