Two things you asked for.

PINCH TO ZOOM
Pinch anywhere on the play area to zoom right in on the puzzle, and drag an empty space to move around. Double tap to snap back to the whole board. Handy for lining up the last few pieces on a big puzzle.

ROTATE PIECES ON TAP
A new switch in Settings. Tapping a loose piece turns it 90 degrees — if you would rather that never happened, turn it off and your pieces stay exactly where you put them.