I received the update yesterday. I was not able to verify my battery level this morning, but it defintely wasn't worse.
Wifi is another story. With the new wifi driver, I'm back to the "missing hardware occasionally on resume" syndrome, where a Scan For New Hardware (or reboot) fixes it immediately. I had this problem with the original firmware, I did not experience it (I think) with the June firmware update, and now it's happened twice since I got the July driver update yesterday. The Wifi speed on battery is much better, but it's disappointing the wireless hardware is dropping out of the Device Manager again. I wouldn't think that issue would be so hard to fix. It's not having trouble connecting to any AP. It's behaving like a USB device that's unplugged between sleep and resume (randomly, rarely, the same issue many have reported around here).