The recommended duties result from probes under Section 301 of the Trade Act of 1974, seen as a more legally defensible way to impose tariffs. They cover roughly 60 countries at 10-12.5%, but there are many steps before final imposition and likely court challenges.
The Trump administration had signaled clearly after the Supreme Court ruling that they would try to rebuild the tariff wall. The initial flat market reaction suggests this was largely foreseen.