This is pretty much the case for any smartphone. A "killer feature" for me is something other than taking pictures and video, running apps, making calls and texting. I have yet to find a phone that has something besides these 5 basic features.
Microsoft has always been dominant in the enterprise market so the retail game is not where they're going to win and they know it. It looks like they're going to go after the more lucrative enterprise market:
"The new feature pack includes VPN functionality that will automatically trigger when protected resources are accessed, Microsoft said, plus S/MIME to sign and encrypt email and EAP-TLS enterprise Wi-Fi support. The pack will be released in the first half of 2014, Microsoft said in a blog post on Wednesday."
source: http://www.pcworld.com/article/2044035/microsofts-enterprise...