This is Dell customized ESXi 6.0 A01 Image Build# 2809209 created using ESXi 6.0 Patch 01 as base.
For details of Fixes checked-in & other information related to Patch 01, please refer to VMware KB article 2111982 or browse to below link.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2111982.

You can refer 6.0 release notes at https://www.vmware.com/support/vsphere6/doc/vsphere-esxi-vcenter-server-60-release-notes.html