New in this release - general usage
Easy mode
A new “Easy mode” was added which allows users to get started more easily.
Diff list extended with tabs for “Recently closed” and “Open now”
Also makes the DiffList easier to open and close.
Closed tabs can be restored
Previously open tabs are now restored on startup, and Ctrl+Shift+T will reopen a recently-closed tab (just like a web browser).
Text diff speed and quality improvement
Speed and quality of text diffs greatly improved, especially for non-western-language Unicode diffs.
Added support for TortoiseSVN
By introducing a new -flavor TortoiseSVN to dp ext. You can read more here.
New in this release - for Simulink users
Multiline properties are now displayed in full
In the viewer
and in the differ
Undock diagrams in the diff to spread across multiple monitors
This new command is called 
Undock diagrams across multiple monitors / Dock diagrams back to main window. It is a replacement for Spread across multiple monitors.
Wherever you put these undocked diagrams, DiffPlug will remember their position for other Simulink diffs, until you move the main DiffPlug window, at which point you will have to reposition them again.
Ignored filter is shown for additions and removals
You can now view and configure the ignored property filter from the detail diff of additions and removals (previously it was only shown for changes). These filters are also respected when dumping the properties of additions and removals into exported reports.
Report export now estimates report size
Improved diff config dialog and defaults.
Better layout, supports copy-paste, undo/redo, drag and drop, and more. The built-in properties ignored as “cosmetic” have added FontWeight and FontAngle for Simulink, and fontSize, drawStyle, midPoint, and labelPosition for Stateflow.
Fixed in this release
Fixed label parsing for Simulink action ports.