It is the latest Official update as of now, Yes.
Is it the latest software? No.
They've got many builds out. Latest is .103, And people are making hybrid .106
I will overlook the fact that you are a Steelers fan...lol. But yes, .75 is the latest 'official' OS. There are "leaked" ones all over here though. I think up to .103/.106
Backing up is essential, make sure to follow those instructions. Using an leaked beta is safer (not safe, but safer) than using a hybrid.
I'm using and recommend .103. I also recommend the .90/.99 hybrid. I have heard good things about Sith's 3rd .103 hybrid too, BUT like I said sticking with the RIM beta's is safer.