There were 50+ M1 issues closed. The overwhelming majority of these features were contributed by the community. Below you can find the highlights of this release.
ConcurrentSessionFilter supports InvalidSessionStrategy
CompositeLogoutHandler
RoleHierarchy from Map (i.e. yml)
CookieCsrfTokenRepository
InvalidSessionStrategy on SessionManagementConfigurer
csrf() is invoked, future MockMvc infocations use original CsrfTokenRepository