It is no more a surprise, a File System has been introduced with Open AT Application Framework 2.51.
This is a major improvement, which will lead to lots a great new features for next releases.
File system has not just been introduce as a A&D or Flash Object successor (which still remain available), but it is expected to bring essential elements to ease its usage in order to speed up application coding, like: a standard API set similar to any file system implemented under other OS, a tight integration with Developer Studio environment as well.
Have a look to below table bringing a snapshot of overall differences:
Give it a try !