HTC Incredible S users can start spamming that “Software Update” button because Ice Cream Sandwich – in Android 4.0.4 guise – is now available for your device.
To get the update, go into “Settings” scroll all the way down to “About Phone” and then tap on “Software Update” to check for availability. As always, updates are released by batches, so the update may not be available immediately to you but keep on checking this couple of days. Enjoy!
Thanks @evofantasy for the tip!