Yup, they are rolling it out now. You, for $20., can port a number to GV.
This will be nice if you are getting a new phone and/or switching carriers, use your current number for GV and not worry about what new number you get.
If you are under contract still it will term your line and you will get hit with ETF's so it's not for everyone...be careful.
Too late for me really, I already have all my peeps trained on my numbers but I'm glad to see Google finally implementing this.