Hi! We occasionally get questions about whether or not an I/O is planned to be added to Beam. I've added a list of known in-progress I/O Transforms to the "Built-in Transforms" page (where in-progress is defined as "has a JIRA issue"). The Built-In Transforms page is the publicly visible list of I/O transforms, so it's a natural place to let users know what's also in-progress.
You can find the current list here: https://beam.apache.org/documentation/io/built-in/ I may have missed one or two I/Os (there's no good way to find them in JIRA as far as I can tell), so if you're working on an I/O Transform that you intend to contribute to beam that's not listed, feel free to send a PR adding it to the list. Thanks, Stephen
