The official Ice Cream Sandwich update for the Acer Iconia Tab A500 was scheduled for a release on April 27, alongside the refresh for the A100.
If you have an Iconia Tab A500/A501 you might want to follow the source link below and download the application called ICONIA TAB Update Enhancement. Description says the “application software is required for the ICS upgrade. Please download”. If you haven’t received received the official update to ICS, this application might help you, as the video below outlines. We’re not entirely sure what this app does aside from checking for updates but if that will get you the Android 4.0 refresh earlier we’re totally fine with it.