Right now, that feature isn’t available within Trello, but I can see the use case for it. I’ll pass your interest in this on to our team for consideration—let me know if there's any additional info you'd like for me to send their way.
If you're curious about how our team decides on what requests we work on, this article gives some insight into that process: http://help.trello.com/article/724-submitting-feature-requests-for-trello. We've also published a blog post with more detailed and visual information here: https://blog.trello.com/feature-requests-unite-support-and-product
If you'd like to see our latest features and releases you can take a look at our dev board at http://www.trello.com/dev. Our mobile boards are available at https://trello.com/b/5tj4qAvo/trello-ios-app and https://trello.com/b/ud59t1fL/trello-android-app.
I just want to second the need for this feature! I use Trello for retros bc the cards are fairly intuitive to use and I'd love to have a feature that would allow me to allow anonymous feedback for authenticated users. (Ie, an 'anon' mode for user or a 'retro' mode/phase that I can activate as the board admin for that specific board)
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