Great question — answering as the UphillTech team:
Joker : Because it's all...part of the [marketing] plan. The initial trailers are called teaser trailers because they're designed to do just that: provide you with a little teaser for the film. These are usually just to announce that a film is coming and to start building anticipation, and possibly because filming isn't quite done or there isn't enough film ready to build a larger, more cohesive trailer. This is also a marketing stragegy designed to build anticipation for a much larger marketing campaign to come. The next trailer is usually much larger and reveals a bit more about the overall plot of the film or the ideas behind it. These may be revealed at/during large events such as...
Full answer by MattD: https://movies.stackexchange.com/a/33647 (CC BY-SA 3.0).
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