Hmm... non-authoritative guesses:
* We had a ton of next-gen stories last year, too few for a separate category, but they did fit into the Alt-Universe cat. Probably will also this year, if they get nominated into it
* Well, given how we already have Best Drama for the A-plot centric ones, I'm leaning to stories that have A-plot only in a supporting role. E.g. Awaken My Heart falls into this category. But there's usually some overlapping.
Michael