Multiple choice markets as containers for groups of binary markets

Binary markets with outcomes other than YES/NO

Multiple-choice markets with answers that sum to any creator-chosen number

Binary markets as an N=2 special case of linked multiple choice markets

Automatic market resolution defined in terms of other data sources

Please suggest other improvements and I'll add them as answers. For last year's market, see 

Note that these answers have significant overlap. Any codebase change that resolves "Binary markets as an N=2 special case of linked multiple choice markets" to YES would likely (but not guaranteed) also resolve "Binary markets with outcomes other than YES/NO" to YES.