I'd say we have a very solid chance of getting an Amanda Ripley ongoing. Maybe with Zula, but that character has the stink of a certain creator on her so maybe not.
I'd say a David book would be fun, but I don't think we'll get Prometheus stuff for a while. Basically the standard Alien stuff will have to sell well and enough people will have to ask before they touch that or Covenant.
I personally want a Predator ongoing with Ahab.