As mentioned in the announcement for the latest weekly (and hotly debated over at OperaWatch), we've gone back to the old feed icon rather than the new one from Mozilla. As you can see from the announcement, it looks like Mozilla requires anyone who wants to use the icon to sign an agreement.
While it seems strange that they decide to bring it up several months after the icon was accepted as the "standard feed icon", I think we should wait and see before drawing any conclusions. It looks like not even the Mozilla Corporation agrees internally on what is really going on, especially with the trademark application for the icon. Apparently, clarifications are on the way.
That said, they are going to have to send out a lot of forms to people and sites all over the world if this is they way they choose to go. And while I can understand the desire to prevent people from using the icon for unrelated things (to avoid confusion), I really don't think this would turn out to be a big problem. If all major browsers (and sites) use the same icon for newsfeeds, people will automatically think of newsfeeds when they see the icon, so anyone trying to use it for something else will probably have very limited success.
Standards should be kept open, and this is what Opera has always strived for. When we introduced the security information widget in the URL field, we talked to the other browser vendors so that we could agree on a standard way to show security information to the user. We never expected them to sign any agreements because we introduced them to the concept.
Now we should wait for Mozilla to clarify its position. People are pulling the icon from their sites and products, which might be a good idea while waiting for things to settle down. But let's allow Mozilla to make up its mind internally, and then explain where they are coming from. I am sure that everyone will manage to come to an agreement in the end.
Update: Things were sorted out, and the icon is back in Opera.