New Iran deal
Higher corp taxes
Higher upper tier individual taxes
Uncap state tax/property deductions
Gun legislation
New Iran deal - Maybe, but doubt it's high on the list of priorities. Remember that Schumer was against the Iran deal.
Higher corp taxes - Almost certainly. They have to pay for free handouts somehow.
Higher upper tier individual taxes - This too. They hate wealth, unless it's their own.
Uncap state tax/property deductions - Don't know enough about this.
Gun legislation - They will try, as Obama did. No way the Supreme Court approves it, unless they pack the court.
At the end of the day, both parties promise big things if they win, and fail to deliver on most of them. Republicans controlled all chambers in 2016 and did basically nothing. The Democrats are much more vindictive and dangerous now, so who knows.