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It's a street track, so it'll be bumpy with little grip until they get rubber down. Problem is that there's relatively little track time for the IMSA cars, and any rain will wash a good deal of that rubber away. Also, like any other street/semi-permanent circuit (think Le Mans or Spa pre 2000 when the whole track became private property), the road is crowned in each lane. That means that water will pool in the "tram lines" (grooves where road cars normally travel).
That, and Detroit is a true street/semi-perm. track with little run off, so if you go off, you're probably going to run into something. Think back to the end of the race in 2014 I think it was when it rained the last lap or two.
I think that this race will be a hairy one for some, especially if they get a lot of rain. That does make watching the race fun/interesting if you don't have a dog in the fight.
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