DLNA/UPnP is your only choice. It is an International standard for playing back media. AirPlay is apple only with some ILLEGAL ports in the android marketplace
Here is a list of the new stock application/settings GUIDS that I have found so far:
"5b04b775-356b-4aa0-aaf8-6491ffea562a": CompanyApps
"5b04b775-356b-4aa0-aaf8-6491ffea562c": SIMApplications
"5b04b775-356b-4aa0-aaf8-6491ffea562d": Family
"5b04b775-356b-4aa0-aaf8-6491ffea5647": BackupSettings...
It seems like they got Wi-Fi usage right in WP8. If Wi-Fi is connected it will go over Wi-Fi unless someone were to code an application to specifically use just the phone modem (haven't seen that).
The attached drivers are signed and work for Windows 8. Let me know if these work with the DVP or not. They are actually Lenovo Drivers but it is a similar chipset.
It sounds like the internal SD card crapped out. You could try my unbrick method but it sounds like it isnt being detected. Check in device manager to see if the USB device is being detected.
USE AT YOUR OWN RISK AND BACKUP! UNCONFIRMED!
To do this you need to have my Supreme Shortcuts application installed on your phone. This is not in the marketplace and you need a dev unlock or something similar to install it. At this point I STRONGLY suggest backing up your phone. I have NO...