Recently we've seen a few updates getting announced the same day as they are released. Various DLCs related to national holidays or other cultural events usually fit this bill with the Halloween and Festive Surprise updates being officially announced on launch day.

However this may be the first time that Rockstar announces an update after it was launched, at least partially. Yesterday we reported on the Karin Sultan and Bravado Banshee being added to Benny's Original Motorworks, unlocking a wealth of customization options for both of them. Players have also discovered the contents of the Valentine's Day DLC in the update's game files. Another significant change brought by the update was some much needed changes to the Cargobob which the community had been asking for a few months hence.
All of this new content was announced today in a Rockstar Newswire post which also showed off a new Adversary Mode that came with the update, however this wasn't accessible ahead of time.
Drop Zone features up to four teams jumping out of high-altitude Cargobobs. You'll need to maneuver to the ground and be first to hit land without dying. Once your team has reached the designated drop zone you need to hold the area for two minutes to win. The other teams will be coming at you to claim the ground. Currently five maps, Pillbox Hill, Richman College, Elysian Island, the Mirror Park cul-de-sac and the Sisyphus Theater make up the Drop Zone roster.