Dev Build 2078 is out now.
After many requests, files and folders dragged onto the dock icon in OS X (or opened via Finder) will open in a new window. They can be dragged onto an existing window to open in there instead. Folders opening in a new window is a clear win, but files less so - it may need to become a setting.
There's a context menu item for Reveal in Side Bar, which will expand any open folders to show the current file. Ideally it would select the file too, but the side bar selection doesn't work that way, it's something I'd like to change in the future.
Otherwise there a few miscellaneous changes, some of which are important for ZenCoding, hence the back to back release with 2077.