For ease of reading I will post Grants answer from the community forum... regards ... Kirk.

There's three changes you will notice:  

Extra disk space

We've given you approx 25% more disc space for recording.. you'll notice your free space has increased in the planner.  

Stop/Restart of Recordings

Recordings that are stopped can now be restarted by either the banner or TV Guide. Additional parts are appended with 1, 2, 3 etc...  

Performance

Some performance increases... Updates are now done in the background.
You will notice this on boot where you can use the unit as soon as TV shows. No waiting for the 'updating.. please wait' to clear from screen.  

And other lower level bugfixes.

Edit: Formatting changes