Crazyhouse

I don't play this variation much and I wonder if you promote a pawn into a queen, but your opponent takes your new queen, does he get to place down a pawn or a queen?

pawn

Promoted pieces demote back to Pawn when captured, in Crazyhouse. In the variant 'Loop Chess' they would stay promoted.

Also note that a Pawn dropped on second rank regains the right to advance two ranks, but Rooks dropped in corners never have castling rights.