So I was browsing through the Resident Evil's Wiki and suddenly I stumbled upon something noteworthy. It seems that Xûr itself is an easer egg aka a cameo. This dude is The Mysterious Merchant from Resident Evil 4. Click on the image below and see for yourself
http://i.imgur.com/5sBpbh8.jpg
Edit 1: Capcom is spying on Bungie!