After the release of elementary OS Freya, the team behind it is busy on making Freya even better with some updates and making new features for future versions. One new feature in development is a new open file dialog. The new dialog will be slimmer, will add history navigation in path bar. The developers are using Gtk modules, so they don’t need to fork from upstream and compatibility won’t be a problem.
The new open file dialog will land as an update in Freya soon.