So I just installed the March update and noticed that my Wifi driver now ends in .168 instead of .150 as previously. I've been having pretty shitty battery life, about 4-4,5 hrs (Surface Pro 2, yes) with bluetooth on and have been suspecting the WiFi adapter to be the culprit. It's been like I never got that October update. I noticed the settings on the Balanced plan had been reset to "maximum performance" on battery and I changed it to maximum battery life again. Let's see if there's any difference now.