Underworld movies?...?

I saw Underworld 3 Rise of the Lycans last night and have seen all the other movies, but after seeing the 3rd one I feel like we haven't been told the whole story. I want to see more! I was expecting to see Viktor when he found and changed Selene in the third movie, but they didn't show that. Do you know if they are planning on making a fourth movie? If so when? And do you feel like they should make another movie? What do you think that movie should be about?