Actually, let me clear up some of the confusion. The February-April ICS date mentioned was ICS estimated release for ACER's new hardware. For example, if you buy an a200 they will tell you to look for ICS starting in February as an OTA.
Again, everyone needs to watch actually what ACER is actually saying. Because they are releasing new hardware (really nice what I saw at CES) with HC, it is nuking up the waters. I stood there at CES and watched a person come up and ask 'when we getting ICS?' and they replied starting in Feb. But, when I asked the salesman, are you saying we're getting ICS on the a500, starting in Feb? The sales person said, no. That this was for these new tablets they're releasing now with HC. But, the person asking had already walked away assuming they were talking about all tablets with HC.
So a lot of people are taking this as ACER saying older equipment will also be getting the ICS OTA. This is not clear, nor has it been clear when we've talked to ACER directly. It really depends on which way the wind blows. They told the 'suits' here that it wasn't then was, and then it wasn't. So, maybe you have to drink more to understand it <lol>.
So, if you want ICS then load a custom ROM that already has it. You can always flash back if and when they release it.