And the A2DP is still supported in Windows 8.1 since it was brought by Windows 8. As a consequence, when an iPhone/iPod is BT appaired to the PC its speakers should be able to play their music.
As I previously mentioned, this particular A2DP role (sink) is not supported by Microsoft. Perhaps Microsoft will consider adding support in future releases if you
provide them feedback through Windows 8.1 forums.
