so does that meen there wont be like a ending or something to the story?
At the moment the TBP team creates only the ships and all the stuff, but not the missions.
But there are many campaigns created b other people (just check the "Heat 'em up" website, recently announced in this forum for some).
And there are many endings to the story of B5. For example with an erlier release of TBP came a mini-campaign about the Earth-Minbari war (which was later adapted for the newest builds).
And while it is the end of this story line, that story took place 10 years before the actual storyline of the Babylon 5 TV series.
After the series was completed after 5 years, JMS produced 5 films and a spinnoff series called Crusade.
At the moment he is working on something new again, in the Babylon 5 universe.
While there are many storylines that have an ending, there is still room for more stories, so in a way there will never be an end.
Like George Lucas said (or quoted?) in the "making of" of the Special Edition of Star Wars "Art is never finished, only abondend".