You can expect a number of changes with Apple's latest addition of OS X.
One major change you will see is the dock.
The new dock has improved the design of the icons. the new dock, as well as other UI improvements lessens the UI fragmentation between Apple's Operating Systems.
If you would like to read more about the upcoming changes Apple's gives insight about there design philosophy.
What are your thoughts about the up coming changes coming to mac this fall? Let us know in the comments below.