Our Bible! app is now available in the Windows 8 app store. (The current release only support Intel processors (not the ARM chip in Microsoft Surface), but we're working on building it for ARM now that we have access to a Surface.)
This is a very early release with limited functionality, but it does let you read and navigate books, sync last read location with other Logos products, etc. Our team is working hard to add more functionality, including notes, highlighting, etc.
The goal is to build a tablet/mobile app (and hopefully Windows Phone 8) that is similar to our iOS and Android apps; not the full Logos Bible Software, but a useful subset that is well suited to mobile use.
http://apps.microsoft.com/webpdp/en-US/app/bible/c54ee3d8-1ccb-4265-89ae-41ffb92f65e0
We also have a Windows 8-only "Verse of the Day" application that does run on Surface:
http://apps.microsoft.com/webpdp/en-in/app/verse-of-the-day/cb3a23bd-c12a-4e15-b7fa-322b2e5b1236
If you like either app, a rating/review would be helpful. (And If you feel you can't give a good review of the Bible! app until it does everything the 3 year-old iOS mobile app does, we'd appreciate your holding your review until a future release! :-) We know it only has a subset of the planned functionality right now.)