Morlun is a vampire of sorts and a newer villain created by current Amazing Spider-Man writer J. Michael Stracynski. To say the least, Stracynski’s run on Amazing Spider-Man has be underwhelming and controversial. Many think that his story-lines start out strong, but never have an ending that lives up to their promise. I can’t say for sure, as Ultimate Spider-Man is the only Spider-Man title I read on a regular basis.
Morlun was part of a larger storyline that attempted to re-define Peter’s origin and tie it to more mystical means. The idea that Spider-Man is the bearer of powers granted by a Spider totem was floated. Similar notions were hinted at for his many animal themed villains (Vulture, Rhino, Puma, Lizard, etc.). The story culminated with Spider-Man dying and being reborn. His powers were altered and he gained organic web shooter (similar to the movie Spider-Man) and his Spider-Sense allowed him to “listen” to spiders. He also developed Wolverine-like claws in the form of one long stinger than emerged from each arm.
Seriously, I’m not making this stuff up.
Anyway, back to Morlun. I’m not saying they won’t use him as a villain, but I can bet at this point in time, they’ve haven’t given it much thought. The studios, writers, and director will all have different ideas as to who and what villain they want. Raimi stated over and over that he didn’t want to use Venom unless he had an idea that called for the character. Also, there are too many classic villains left for Spider-Man 4. Just click that link to see my thoughts on that topic. Truthfully, we won’t know anything concrete for at least a year. When an actor is cast, then that will be the first real proof we have.
Until then, let the speculation continue (and I’ll continue to speculate a Spider-Man 4 without Morlun).