Current OpenwrtYun is based on Openwrt attitude_adjustment 12.09 (09/2012)
Upcoming Openwrt barrier-breaker 14.07 (07/2014) and it is reached barrier-breaker 14.07-rc3 (rc:release candidate) .
Any release plan?
Not yet. We'll plan porting and testing once released.
In the meanwhile, any contribution is more than welcomed!