I want factions like Oblivion had. The ability to join multiple factions, of course.

There may not be Magic in this game, but you could have a hero and assassin type guild. In oblivion, there were monetary rewards (and sometimes bonus items) for doing these missions. It`s a good way to have an arcing story that`s not directly involved with the main story.

A ghoul faction would be good too, perhaps with the option to become one (much like vampirism in Oblivion). You would be less liked by humans in general, but ghouls are much less likely to be hostile, and feral ghouls would leave you alone unless you bothered them. You`d have 100% rad resistance as well, but perhaps you`d also get attacked more by creatures and humans in the field as well.

More weapons types too, perhaps modifiable weapons neh?

Any ideas yourself? Perhaps just what you`d really like to see them keep?

You realize this is not developed by Bethesda..

Really? Odd.

Didn't they develop the first one? Or was it the same thing, Obsidian Entertainment developed that too?

Still, it's based around Oblivion's level of interactivity, so it isn't unreasonable to ask it to take cues from some good parts of it.