Update, I have Avast virus scanner. I had to uninstall it (Disabling does not work), once uninstalled and rebooted, I was able to lunch the game. A temporary fix until they figure something out.

Same problem.
I go to my steam library.
Click Dayz.
A black command prompt window opens (loading BE).
Wait.
Windows disappears.
Wait. Wait.
Nothing happens.
I check windows task manager and I see
Dayz.exe *32 memory usage 180k
Dayz_BE.exe *32 memory usage 1,584
I try to shut down both processes, and computer begins to freeze.

GeForce GTX 670
Intel i7-4770k CPU @ 3.50GHZ
8GB Ram
Windows 7