The nature of the threats and who made them was not revealed in the attorney interview yesterday.
A threat to keep quiet "or else," if it happened, would be attempted extortion and a felony. More general threats of violence would be a crime, too.
Almost certainly Special Counsel Robert Mueller, who is conducting the criminal investigation into Trump and his associates, will reach out to Daniels or her attorney for more details. If anyone in Trump's circle of acquaintences made any threats, then the question will become "what did the President know and when did he know it."
Some legal pundits have been speculating that the Daniels payment cover-up and possible violations of federal law involved might actually be more damaging to Trump ultimately than the Russian collusion scandal. If so, then the classic Watergate rule will be proven again: "it's not the crime, it's the coverup."
Definitely stay tuned.