I’ve had the pleasure of going through several Windows 8 PFE labs now and have been very happy with the process. The process is for developers working on Windows 8 Metro apps that want to publish to the Windows Store. Microsoft has offered the time of a Windows specialist to walk through your app, the certification process and guidelines. If your app is deemed ready by the specialist, they will provide a Windows Store token. Each lab session is scheduled for 2 hours, but I’ve found that by the 3rd and 4th apps you’ll already have your apps in solid condition and breeze right through the meeting.
You don’t need to go through the lab session for your 2nd, 3rd and n-th apps, but it may help. The reason I’ve been through several sessions is because of the use of multiple Windows Store accounts. If you intend on publishing from the same account, you can have up to six pending apps at any time. Pending means that you’ve reserved the app name within Windows Store for up to 1 year. It also appears that getting a token provides a 2 year waiver of the Windows Store developer fee, which is longer than the 1 year Windows Phone developer fee.