So I found a way to see a skull opposing faction players level. Or at least their level range...
Requires lots of luck more than anything. And only applies to locks and hunters.
I was questing when i noticed a pet running up on a mod next to me, odd because i didnt see a player. I clicked on the pet wondering if i was going to get raped when what did i see? Level 70 cat.
Now, the weird thing is im level 45, so i shouldnt have seen that and, sure enough about 2 seconds later the nameplate level went to a skull. So i guess it works like, if you get in range of a pet and the player is out of your range you can quickly check the pets level, giving you an idea of the players level.
Like i said, completely useless, but everything i post gets deleted anyway, so i guess it doesnt matter...
cheers, thanks for reading.