Hi, VSZ.
It’s been there for quite some time already. Blender devs just don’t bother to promote such a “minor” feature =)
Shift+F – Unreal-style navigation, mousewheel scrool for speed variation;
TAB – walk mode, V – jump, Space – move to where your aim is pointing.
Just checked 2.72 official release, works fine.
For me personally it’s not wery handy to use UE-style navigation in Blender. Or maybe I’m too used to default Blender navigation. But it’s very helpful to walk around your scene before exporting it to Unreal to check the scale and the overall feel of the scene and props you’re working at.
Cheers.