The guy holding Vader's helmet in the first pic doesn't make sense considering the armor was incinerated in a pyre at the end of ROTJ.

Two thoughts - it's likely certain parts of Vader's suit were made of extremely durable materials, wouldn't be surprised to see bits survive. Second thought: it's also likely Vader had multiple suit parts stashed away in different places, like his personal retreat and such. Not a stretch to imagine someone looting those places after 30 years.

Yeah it makes sense to me that Vader likely had some spare parts for his suit. The concept art is pretty cool looking to me. Whats up with Chewbacca's right hand though?

- The wreckage of a TIE fighter and Star Destroyer littering the landscape of the desert looks quite striking. Using an overturned AT-AT as a makeshift dwelling is a brilliant idea.

- The alien in the second image reminds me of a small version of the Drac from "Enemy Mine" (morseo than the "Bill & Ted" creature he was described as resembling). The little droid reminds me a bit of Weebo from "Flubber". This piece of artwork looks like something from the Rebels cartoon series: the male and female could easily pass for Kanan and Sabine with the dim lighting.

- Sadly, I can see a bit of Luke in the cyborg from the first image -- but maybe that spoiler report from a couple weeks back is influencing my perception. For all we know, it could be Leia holding Vader's helmet. Now that would be a twist. It is curious that there have been virtually no rumors regarding her role in the film... but I doubt Disney would have asked Fisher to lose 40 pounds if her character was now a cyborg hiding under robes the whole movie.

The caption reads: BIONIC ARM FROM WAR WOUND. From what I've read, this concept was discarded early on -- though there was that alleged scene description that mentioned Chewie had his arm in a sling. Maybe he gets a robotic arm by the end of the film? Could be cool.

if you're going to have someone holding a Vader helmet then it sort of needs to be the real one and not a spare. I seriously doubt Vader's armor, or cyborg parts for that matter, would have completely burned in the pyre. It's either made of metal or something else that is just as heat proof.

One of the concept pieces of the helmet is even labeled HELMET_BURNT. It reveals a metal mesh (hiding beneath the shiny black material) that gives the helmet and faceplate their shape.

The pics of the helmet make me think the rumors about someone finding Luke's hand floating in space are wrong and it's actually Vader's. That would make a lot more sense since Luke's hand should be at the center of a gas giant.

I'm still holding onto my hope that the desert planet is actually Endor suffering the environmental impact of fallen debris.

The second to last pic is labeled "wampa saber." Is there going to be a wampa jedi?

I also noticed one pic labeled as "Massassi temple." If I remember right, isn't that the temple on Yavin 4 that Luke converts into the New Jedi temple? I think it was also originally Exar Kun's (ancient Sith Lord) temple.

The helmet looks like its sort of scuffed up and a bit damaged but doesn't appear to be burned but its hard to tell from just that picture. Plus it may have been made out of some kind of a material that didn't burn like you said, so it could be the Vader helmet that Luke burned. Who knows what it'll actually look like or if that will even make the final film though since its just concept art.

No, but that does sound hilarious.

It looks like the hilt is fashioned out of a wampa's claw. I think MakingStarWars.net mentioned something about this being the bad guy's saber.