What could new US sanctions on Iran entail?

INTELLIGENCE SUMMARY

The US says it is preparing to announce new sanctions on Iran. It's been billed an economic D-day and is expected to add further pressure on the country's economy that's already been battered from previous sanctions and a US naval blockade. The renewed economic pressure would not be the first time the US has used economic tools at its disposal to corner Iran. But what could the new measures likely entail?