Mike Belopuhov of OpenBSD presented at this weekend's AsiaBSDCon in Tokyo about the state of OpenBSD 5.9. There are PDF slides available to those interested.
Some of the new features for OpenBSD 5.9 include EFI support for x86_64/AMD64, initial support for Intel Bay Trail and Broadwell graphics, new drivers, Intel Skylake NIC support, networking improvements, 802.11n enhancements, various security improvements, and more.
OpenBSD fans wishing to find out more can see the tentative list of OpenBSD 5.9 changes via this OpenBSD.org page. OpenBSD 5.9 is scheduled for release on 1 May.