"...latest startup trends"

I dont imagine startups start their ideas based on trends, unless you mean technology trends. But in any case. This information would be very hard to come by as most people/companies dont announce what they plan to build until they have an MVP.

The only thing I can suggest is to follow a bunch of hackathons, hopefully ones that are not limited to sponsorship tech or industry. And try workout the trends from there.

side note: this could be a nice little machine learning project :)