Google gave really only two SEO focused sessions at I/O this year, although, Google published all the sessions they thought SEOs and webmasters would care about.
This talk was given by Tom Greenaway and John Mueller of Google:
The next one is more of a basic overview on SEO and search. The session description is below but I believe Google summed some of it up in this blog post.
Google Search can be a great source of traffic to any website. This talk will highlight ways to build out a site’s presence in Search, be it for yourself or for others, through hosting platforms, content management systems, or plugins. Learn about the best practices, tools, structured data, and APIs to make it easier to work with new and updated pages over the whole content lifecycle.
This talk was given by Mariya Moeva and John Mueller:
Forum discussion at Twitter.