That is some amazing stuff! Seems like Nintendo has gotten in the habit lately of releasing more art for their games through social media. I hope someone is collecting all this stuff!
I'm betting these pieces of art are going to be in 3D in the M:SR's Concept Art Gallery
Reminds me of the 90s style of pre rendered concept art. I know those are more primitive but I suppose is the shading and lighting.
If this game flops hard, I don't know what can Metroid do at this point....