So the TSA finally figured out that xrays do in fact see through bags and that its not really necessary to remove your protected laptop and throw it into a bin. But oh it was so entertaining while it lasted. In traditional fashion the new guidelines (TSA website) were announced but interpretation is left up to travelers and of course the daily whim of local TSA. So here is what I found. Traditional top zip only bags won't cut it. The TSA image below shows the approved styles of bags:
The sleeve style will prove to be the most usable as it will work with your existing bag or even stuffed into your carry-on roller. I just wouldn't suggest inserting a MacBook Air into it as the TSA didn't understand the new technology (TSA response and ipod also delayed). Here are some bags that appear to meet the TSA guidelines:

• Followes Body Glove Sleeve fits up to 17". This would protect your laptop should you have to remove it from your current bag.
• Targus Laptop bag 17"
• Targus 14" Bag
• Targus 15.4" Bag

Please note the size of your laptop when selecting a bag. The T series is 14-15.4" while the X series is 12-13.3" depending on your model.