There is both logic and confusion in the approach of taking employees as a sample set for testing anything new. 

Yes, you have a captive audience and you have the potential for A/B type testing as you can more easily "tell them what to do". 

At the same time, who really trusts it is truly anonymous, so what changes in behaviour are triggered by the fact that this is being done with (for?) the employer rather than for oneself?

That said, better this than simply more "waiting" as many firms are still doing.

Good luck Partner Re. Hopefully you get some insight and your employees get direct value.