There are some minute adjustments being made like spacing and dynamics of the scores. Sibelius 6 introduces Magnetic layout that will intelligently spot the positions where you may pointed the mouse carelessly for adding the scores.
Sibelius 6 has the ability to be used as a ReWire slave. Now you can arrange and route the output from Sibelius and sync them to the ReWire DAW.
All in all Sibelius 6 is a very handy tool for all the music lovers to create some catchy musical scores. Its more easy more professional and more time saving.