Cormac Hogan from VMware has a three part Tech Preview series. The series is over at vSphere Blog.
The first part covered Distributed Storage Tech Preview which has a video. Basically what it does is aggregates the hosts’ local storage and makes a single pool of storage shared across all hosts. Within the blog Cormac has other links highly recommend reading those.
The second part was Virtual Volumes (VVOLs) Tech Preview which also has a video.
"What if the vSphere admin could decide up front what the storage requirements of an application are, and then tell the array to create an appropriate VMDK based on these requirements? Welcome to VVOLs"
Lastly the third posting was Virtual Flash (vFlash) Tech Preview. "To date, VMware has done very little around flash. We only have the smartd introduced in vSphere 5.1 to monitor Solid State Drives (SSD) attributes and the swap to SSD feature....."