I found that after applying, the first notice I got was when there was something to Beta test and I was sent the email with the link to download. At the moment the Andriod version is stable so theres no Beta testing going on, not sure about IOS. But when you get the email with the download link you know your on the team.
Area Manager - Taranaki, New Zealand
Samsung Galaxy Ace (GT-S5830) - Gingerbread (Andriod 2.3.5)
New Zealand - Waze Client Beta Tester