MariaDB 10.2 was released as stable (GA) with version 10.2.6 on 23 May 2017. Please also tag with mariadb for search purposes.
10.2 is again using the InnoDB storage engine by default instead of previously XtraDB. It also introduces Window functions, recursive and non-recursive Common Table Expressions (including the
EXECUTE IMMEDIATE, and supports spatial indexes for InnoDB tables.
For more details see the article Changes & Improvements in MariaDB 10.2.