There's a Reddit post about a way to see Xurs inventory before he arrives. Whether or not this is legit or not is still up in the air but if it is then his inventory will be the following items.
Helm of Inmost Light
Aclyophage Symbiote
Sunbreakers (lol)
Patience and Time
Gauntlet Engram
English
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Re-read that post guardian. That is from a previous day back in May-June area. He wasn't able to see future sets that Xúr will sell.
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Edited by avenwing: 10/17/2014 4:04:21 AMAh, my bad. I hope you are wrong though and he sells The Last Word. Me want.
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I was blessed with it during a tiger strike and the gun is a beast.