The watercoloured one (top right) for Animedia is part of something the official Digimon site named as the "Digimon Tribute". The illustration here is by mangaka Kuwahara Sota of Kurenai Ouji. I suspect we'll get an explanation of whether or not this is a tribute illustration series or just a one-shot deal in this issue. It'll be nice if it'll be something ongoing during the film series!I think we can embed those... along with some others.
The previews of various upcoming images in magazine include Newtype, Animedia, and Otomedia.
I'm pleased that not only is it 4 pieces of all new art, but that we are getting a nice looking one that isn't in the shows own style.
All the images are from various official Twitters.