If you'd like to attach the Pi to something, you've got 4 options now!
The original Model B v1 had no mounting holes at all (oof!)
The Model B Rev 2 and Model A came with two mounting holes

Now the model B+ has four!

And they're in a rectangle

Note that if you have a mounting plate or case designed for the model B, its unlikely it will work with a B+! Check before purchasing!