From Aaron Forsythe's
article"Starting with M11, deathtouch no longer ignores blocking order in
situations involving multiple blockers. Additionally, you only need to
assign a single point of damage from a creature with deathtouch to each
blocker, which makes deathtouch a potent combination with trample. A 4/4
with trample and deathtouch can assign one damage to a blocking 8/8 and
the other 3 damage to the defending player. "