To be clear, there is not a design difference. Sure, they icons may come off slightly more square or drop some of the gloss, but the same design principles that make MiUI great will still be used.
With that said, you will still have most of the improvements from ICS. A good example is the settings app, which both versions are posted above. With the ICS version, the settings have been cleaned up and simplified where possible. Here's a quick list of the improvements you can expect from the ICS version.
Better Camera. You can now shot in a panorama mode, letting you take one continuous image just by rotating the phone. You can now do on-the-fly video effects, better face detection, and a simplified user interface. My favorite feature? It's super fast. The time in between pictures has been improved dramatically.
ICS Keyboard. At first I couldn't tell that it was different from the MiUI default keyboard, however misspell one word and you'll quickly see that it's the default keyboard from ICS. The new keyboard sports a much improved spell checker, now only suggest 3 words at a time, and supports the use of third party dictionaries and spell-checkers.
Other Improvements;
New Contact Manager.
Improved Gmail
Improved Web browser
Re-sizable Widgets
Swipe to dismiss notifications, tasks and browser tabs
Download and Install
While they are a few glitches, I've found this build to be pretty reliable on my captivate. Here's a link with instructions and required files XDA Post.
Issues;
-Trying to access Data Usuage will end in a force close. To get around this, simply click More, then Mobile Networks.
-Themes does not work out of the box. In order to get the MiUI themes app working, use this patch.
Bottom Line
Given the age of the Captivate(July 2010) I thought ICS would be a bit out of it's reach. However, just a few days in my Captivate is running as fast and stable as a brand new phone.







