Just checked a minute ago and the item description is STILL incorrect. The IOS version of MW will NOT run on IOS 5.1.1 which I and others posted MONTHS ago.
Now I see someone just locked out their iPod.
When I tested months ago I found that MW no longer runs on,
iPod 4th gen or older
iPad 1st gen
iPhone 3 or older.
The app will download and overwrite your working older version without warning you that it is NOT compatible!