"Google Wave—We announced that we'd stopped development on Google Wave over a year ago. But as of January 31, 2012, Wave will become read-only and you won't be able to create new ones. On April 30 we
will turn it off completely. You'll be able to continue exporting individual waves using the existing PDF export feature until the Google Wave service is turned off. If you'd like to continue using this technology, there are a number of open-source projects, including Apache Wave and Walkaround."
It's sad to see something good (at least for online gaming) go down. I have backed up all my 1-on-1 game waves and will closely follow the developement of Apache Wave and Walkaround. It was good while it lasted.