VMware announced vSphere 6.0 beta program in June 2014. vSphere 6 beta is now open to the public and signed up users will get early access to new exciting features of world’s trusted and leading virtualization platform. You can sign up and download the beta iso image and test it in tour testing platform.
vSphere ESXi 6.0 beta iso : https://communities.vmware.com/community/vmtn/vsphere-beta
Source: vmware.com
Need to test VMware esxi6.0