Microsoft fans are well aware of the Windows Insiders Program and Office Insider Programs which offer users with access to early builds of the respective applications so the bugs can be fixed before the updates is rolled out for the general public.
These are not the only ones, it seems Microsoft also has a Bing Insider Program (via Neowin) which was spotted today, but the program was reportedly started earlier this year in February. If you're interested, you can head over to this link and sign up if you want to be a part of the Bing Insider Program.
It was also mentioned on Bing's Uservoice forum and was mentioned earlier this year,
Hey Bing Fans,
You are a critical component of the Bing experience, and we value your suggestions and feedback, so we wanted to give you a chance to join the Bing Insiders program. Through this program you’ll get access to early builds, new features, upcoming fan events, and be a part of our planning process for the future.
In order to join this program, we ask that you complete this 3-question survey, so we can add you to the list of Bing Insiders.
Let us know if anyone of you is planning to sign up for the Bing Insider Program.
Further reading: Bing, Microsoft, Windows 10