You may find the review by Seth Rosenblatt of Cnet.com helpful in answering your question. Just go to the download section and find it there. What I found even more interesting were the reviews of McAfee by three independant testing laboratories, included in the article. Doesn't exactly make me want to rush out and renew my subscription.
Except sadly they weren't aware of the fact that they were reviewing the 2011 product in fact. It is simply relabelled for marketing purposes around this time every year. Norton and others do the same thing.
Here we go again.
What happens when Users buy the McAfee Internet Security 2012 and find out after buying version 2012, it is exactly the same at 2011 with all its bugs? People may start asking for their money back.