Considering Dyn bought several promised "free for life" DNS services then promptly killed them you need to realize they'll probably do it again. They've apparently decided the best business model is buy out their free competitors and put them out business.
I'm one of those that got an account when they bought out EveryDNS. They committed to keeping it free for life (but charged $5 for the "transition").
I'm actually a little confused by this announcement. I got an email from them this morning about it, but very little information. They included this in mine:
However, because you believed in us and supported this company through your donations, we are continuing to fulfill our promise to you: your service is still free for life.
Not sure what this means for me. I do have what I think they are referring to, a free hostname in the "from-va.com" domain. I don't really use it much, so I don't care if it goes away. But I've also got 2 of my own domains that I use their DNS services for. I'm assuming that will continue to work, and for no new fees. I better be right, or I'll be raising some hell.