Been waiting this from AtLast, and then Google, and now Trimble...it's been years I wanted to find other options then I discovered Adobe Director.

It can import Sketchup files and make it interactive including FPS. Files can be published as a standalone executable file for PC or MAC use (haven't tried publishing as an APP for Ipad use but I know it can be done.) For viewing on the Browser, it requires Adobe Shockwave Player plug-in to run.

FPS
-navigating using arrow keys
-with collision
-open swing and sliding doors
-add sound
-many more

Here's a video on a project I was navigating - http://www.youtube.com/watch?v=t-6HQ8erShM

And more on my blog if you want to try - http://sketchuptodirector.blogspot.sg/