For anyone having similar issues, the latest Toshiba bluetooth stack seems to support the chipset and many bluetooth protocols including a2dp. I have my stereo headset working fine now. You can install it on a 30 day trial, after which you must purchase a licence; http://aps2.toshiba-tro.de/bluetooth/?page=download
I am also experiencing bluetooth issues on my XPS 15 (L502X) which i got last week. I can't pair any devices and when i search for bluetooth devices nothing appears on the list of discovered devices. I am using the latest drivers provided by Intel :
Driver Provider : Intel
Driver Date : 11/10/2011
Driver Version :184.108.40.20601
Any help greatly appreciated.