So far (except as relates to Japanese file open/save dialogs) we haven't really talked about changes to SuperEdit in the 4.8 update.
These fall into four main categories:
Bug Fixes
There are hundreds of course. Most notably, you once again can safely edit the contents of a background field in multiple card windows at the same time.
Contextual Menus
You can now right-click on most objects in the UI (including in overview windows) to pop up a menu of available operations (instead of double-clicking, shift-double-clicking, option-double-clicking, or whatever). One exception in b19 is the list of data-fork resources (a fix will be in b20).
Keyboard Shortcuts
There's now a keyboard shortcut for almost anything you could want to do in SE overview (i.e., 'list') windows - rotating through them, zooming, tiling, navigating, selecting, opening parent items/folders, etc. If you prefer to keep your hands on the keyboard as much as possible in SE, these should make you smile...
Alignment Guides
Card editing windows now have optional guides and rulers that make it a snap to align the edges, centers, or text baselines of objects, or to quickly create them at or move them to specific locations without having to resort to the dreaded Sizes dialog.
If you have questions, sing out...
-Mark