NEC and Fujitsu has this week released new Customized images based on ESXi 6.0 Update 1a.
I hope that all the other hardware vendors will will release there Update 1 image and that it is based on the Update 1a.
You can find them here: https://my.vmware.com/web/vmware/info/slug/datacenter_cloud_infrastructure/vmware_vsphere/6_0
There are also some new 5.5 images: https://my.vmware.com/web/vmware/info/slug/datacenter_cloud_infrastructure/vmware_vsphere/5_5#custom_iso
HP has now released a ESXi 6.0 Update 1.
Cisco and Hitachi has also released a ESXi 6.0 Update 1a.