I know what you mean TC. I have only about 400mb left on my 8gb card so I hope the patch isn't too big. I want to get a 32gb card but I'm trying to hold out for a price drop. Highway robbery with these things.
Second of all, you need to check on the game info on the LiveArea. It supposed to be at 902MB even if you downloaded 1.6GB worth of updates... You might be surprised when look at the System Info and notice you have more memory space than you expect.