The overall trend I would follow is "green". Find properties and amenities based on their energy efficiency.
Your question has some other facets which complicate the issue. I would say condos and lofts are more popular than coops, but the sheer volume of coops lends to more sales of coops. The consumer prefers condos due to their less restrictive ownership rules, although that also seems to be changing.
Buyers are coming from everywhere, we are more than a U.S. destination, we are a world destination. So eastern europeans are the fastest group coming into the city in general, and for the outer boroughs as well. The caribbean community continues to flourish as every other community does too. It's not like we are Phoenix - who goes there? i dunno... NYC attracts from all over the U.S.
Buyers do expect higher grade in new construction. Granite, Vikings, built in appliances, Sub-Zero, etc are expected in any new unit as are hardwood floors. Again, NYC is not a "new" city - many of our buildings were built long ago, so renovations are frequent. Brownstones are better if they are original, but that also depends on the buyer. Hope this helps.