Update 19th Apr
Fault Tolerance now supports per VM 8 vCPU and 128GB of memory. Check out https://configmax.vmware.com/home new site for configure maximum.
VVOLs now support SCSI-3 persistent reservations which can now support WSFC. Which also means you can leverage on vSphere Replication to replicate a WSFC VM without using RDM! Check it out.