Some of them have already been available if you had access to Solaris Support repository, but if not now you can play with ZFS persistent l2arc, which can also hold compressed blocks, or ZFS/lz4 compression, or perhaps you fancy a new (to Solaris) OpenBSD Packet Filter, or... see What's New for more details on all the new features.
Also see a collection of blog posts which have more technical details about the new features.
New batch of blogs about the new update.
New batch of blogs about the new update.