FreeBSD 10.0 stable was slated for November release; however, it isn’t going to happen from the way things are progressing and chances are that the distribution might not even ship in this calendar year.
FreeBSD 10.0 was in alpha state for quite a while and beta version of the distribution started shipping out as late as October. If we look at the original FreeBSD 10.0 release schedule, the stable release was slated for November 24.
We are currently at Beta 3 and with one beta release and three release candidates to go, it won’t be too far-fetched to assume that the stable release will happen in early 2014. According to the latest FreeBSD mailing list announcement, the primary reason behind delay in release of FreeBSD 10.0 stable is because of several bugs which are being currently worked upon.
Some of the features of the FreeBSD 10.0 include support for ZFS TRIM, support for LZ4 compression, support for L2ARC compression, FUSE file-system support, better handling of 802.11n BAR TX frames and 802.11n options, fixes for SMP/concurrency races, 802.11n TX aggregation, SNMP-friendly pf firewall, NetMap framework that allows for direct-to-hardware IO, support for Up to 65536 routing tables, VPS support, support for Unmapped VMIO buffers; Raspberry Pi; Bhyve BSD hypervisor and other general ARM improvements.
For more read, FreeBSD 10 features.