You can now use the ESC key as the equivalent of closing the warning window. When you see the (warning) window before gpppkill ends the link, the default button is now "Restart" and not "Kill". You can now click on Total Bytes in/out to cycle the scale (b, Kb, Mb). Better handling of the size of the main window and the equivalent of a "-h" (human readable) option have been added.
Statusbar (can hide), new popup menu, prefences window got major changes, better way to parse interface names with pppd pids, all dialogs are now modal and appear to the WindowManager as children windows and preference window got a new way to select interfaces.