There will be a card based on the Catapult Turtle/Castle of Dark Illusions situation from the Atem/Player Killer of Darkness duel.After the card based on the Yugi/Ryota Kajiki duel, anything is possible these days.
If Shien and the Six Samurai are based on Oda Nobunaga's life, it's possible for the other Sengoku Basara figures to get cards of their own.
Red-Eyes Black Dragon is Alduin.Seriously, just look at them.
Evilswarm Kerykeion will infect another world.According to the fluff, Evilswarm Kerykeion is Constellar Rasalhague, who has used the Gishki Aquamirror to fuse itself with the thee corrupted Ice barrier Dragons. Ostensibly, she is not evil, in part due to Rasalhague being good in the first place. But she still contains the L-Swarm Virus in her, and as such may infect the next world that she and Constellar Sombres go to, now that the Duel Terminal world is gone.