It seems that Nokia is pushing this software update across the globe. I got mine a few weeks ago. At that time, there was no much mention about it. Now, it seems that the version that I had can help to improve Battery Life
If you have not gotten yours, it might come to you soon. You can also connect your Nokia phone to Zune and use settings to check if there is available update.
After the update, you should get 1600.2487.8107.12070
Let me know if the update is helping the battery performance or not. In my case, the answer is a “YES”.