I've read this letter a few times, and I can't find the part where he offers to let us use the as is Google maps in iOS 6 until Apple's attempt gets better.
It is not just the Google database that is better, it is the search ability. I can put in random keywords, even airport codes and Google will find destinations for me.
Would be nice if my iPhone 4 stopped promting me to upgrade. The removal of Google maps is not something I want to upgrade to.
B
Use the google maps website. It has all the features you need, and you can add it to your home screen. That's what it said in the letter. It's that bit you're looking for.