QuoteDoesn't LR4 have a Maps module? Have you tried that? I'm surprised you can't see the Lat/Long in the normal Library meta-data viewer.
Correct in clicking map mode I was able to see the data just that it is on another tab. However in Develop mode when doing a CTRL + I that info is not available. Furthermore, when you click View while in Loupe mode, there's an option called View Options. From the lengthy drop down list, map coordinates (GPS) are not available. Whereas in the two programs mentioned above CTRL + I does offer those details. Metadata is metadata, display it all please Adobe. Also, no visual indicator in Library mode as which photos are encoded with GPS. When you click on Metadata at the top, the coordinates do not appear. Lastly, I find this strange, say I wish to delete an image file from another photo app such as DPP or ACDSee. Both programs show the updated thumbnails. The deleted image is gone and so is the thumbnail. Adobe hangs on to a useless thumbnail of the deleted image. I'm not sure what good does that serve and why it doesn't auto populate the directory's thumbnail database. I guess it is just another awkward non conventional way of doing things in the Adobe world.
In the Library Loupe view, the right hand bar (the thingie that you can hide, whatever they call it) near the bottom as a Meta-Data view. Does it show the information in there?