The Infinity Gauntlet we saw in Thor was created for security purposes.
In the mid-credits scene of Ultron, Thanos is shown putting on the Gauntlet and proclaims that he will hunt for the Infinity Stones himself. Yet previously in Thor's first solo outing, we see another Infinity Gauntlet among Odin's Vault. What I think is that the first gauntlet was created to represent how it would look while the real one was stolen by Thanos many years back. Plus, notice the vault. Thanos probably gave the Gauntlet to someone, most likely Kang the Conqueror who is the only one of his henchmen that haven't failed him, for safe-keeping until further notice.
The Masters of Evil lineup
Since Infinity War will be the grand finale of the Infinity Stones arc that was established in Thor, these guys will have to be in! As usual, they will be led by Baron Zemo (who has been confirmed to appear in Captain America 3) but the lineup will be different as most members haven't been introduced yet such as the Crimson Dynamo. They will be......
- Enchantress (who may appear in Thor Ragnarok)
- Arnim Zola (this time appearing in his classic robot form from the comics)
- Darren Cross/Yellowjacket (if Ant-Man becomes an Avenger)
Sadly, this is all I can think of because this is taking too long. Bye now!