Interesting that your OS versions are the same, but FW differs.
Alright, then OS update (or FW update too) should come at any given day. Mine still shows GDR3's OS: 8.0.10501.125, FW: 3030.00.40502.411
I got another update(had like 3 updates after GDR3 already)
So i got this update today at morning and it takes up 100mb of space, after installing it said something about microsoft firmware but i was too lazy to read that stuff.