I created a Powershell Script to attempt to set the LLDP property mentioned, and I got a "The Operation is not supported on the object." This is on Enterprise Plus, and setting the cdp options for the same variables work fine.
So, looks like this is definitely in the works, but it's been disabled probably because it just wasn't stable enough or something. Here's hoping Update 1 or Update 2 will enable it.
FYI, here's the script for reference:
$vcenter = connect-viserver vcenter
##function set-vSwitchLinkDiscovery {
#Variables
$vSwitchName = "vSwitch0"
$linkProtocol = "lldp"
$linkOperation = "both"
$VMHost = "myhost"
#Get the specification for the vSwitch
$networkview = (get-vmhostnetwork -vmhost $VMHost | get-view)
$vSwitchSpec = ($networkView.NetworkConfig.vSwitch | Where {$_.Name -eq $vSwitchName}).Spec
#Set Protocol Type and Operation
$vSwitchSpec.Bridge.LinkDiscoveryProtocolConfig.protocol = "lldp"
$vSwitchSpec.Bridge.LinkDiscoveryProtocolConfig.operation = "both"
#Commit Changes
$networkview.updateVirtualSwitch($vSwitchName,$vSwitchSpec)
##}