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In the linked paper (http://arxiv.org/pdf/1407.0026v1.pdf) they suggest that it will be useful for "extremely-wide-field transiting exoplanet searches, realtime searches for transient and variable phenomena, and ... the capability to effectively pre-image unexpected events detected by other surveys". Based on the relative length of the descriptions, they seem most interested in the exoplanet surveys.

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This is right. The other science topics mentioned have longer timescales (hours or days), so surveys with smaller fields of view but bigger light collecting power are better at finding these events.

For exoplanet transits, though, you're interested in frequent time sampling to catch and model the passage of the planet in front of the star, so sampling all the bright stars in the sky every few minutes is a great way to do this. It also explains the high Arctic observing site (lots of stars that never set and can be observed for months at a time).

Thanks for the explanations, guys!

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