No. I went through once in late December and twice in early January. All three times, I was required to take my iPad out of my hand luggage and put it in its own tray, but was never asked to take it out of its case.

I think it's probably as much a bit of hit and miss as TSA here in the U.S. Best to be prepared (i.e., if you have a case that's difficult to remove, don't use it when traveling), but I don't think you'll know for sure what will happen until it happens.