SIMULINK 5.0 has added the following features:
* Intrinsic fixed-point support
* Signal Builder block
* Print Details
* True Color Support
* Mask Editor
* S-functions Builder
* New Model Verification Blocks library
Simulink Version 5.0.1 fixed bugs and Simulink Version 5.0.2 has added the feature of supporting version 1.3 of Simulink Performance Tools.
For more details, please look at http://www.mathworks.com/products/simulink/whatsnew.jsp