Like any major game, NFS: World runs from files stored on the hard drive of the players. Folders and data found in the game files, often reveal possible future plans that developers have for upcoming in-game content. This includes car models, vinyls, events, features and anything else that requires any kind of text to be added to the game files. This data can only be added through patches, therefore every patch is likely to have new content that may be released at any time through a live update (if it's ready). Most of the content added is only text.
Please note that occasionally content that appears in or is mentioned in files may never actually be released. Any appearance or mention of content in files is NOT 100% confirmation that the content will be released.