The call for papers for Percona Live Santa Clara 2018 was extended till January 12 2018. This means you still have time to get a submission in.
I think to be fair, in the catch all “other”, we should also be thinking a lot about things like containerisation (Docker), Kubernetes, Mesosphere, the cloud (Amazon AWS RDS, Microsoft Azure, Google Cloud SQL, etc.), analytics (ClickHouse, MariaDB ColumnStore), and a lot more. Basically anything that would benefit an audience of database geeks whom are looking at it from all aspects.
That’s not to say case studies shouldn’t be considered. People always love to hear about stories from the trenches. This is your chance to talk about just that.