Overwatch has changed, too. Space Marine Terminators are no longer required to fire when on overwatch. In practice, this will probably only mean that Terminators won't be shooting at closed doors (a nasty little trick that the Genestealer could do under 3rd edition - close a door while within LOS and hope that the Terminator's storm bolter jams), as well as when multiple Terminators on overwatch have LOS to the same Genestealer, allowing the Space Marine player to declare which of the Terminators will fire instead of all of them automatically firing. This change basically makes the Space Marines more intelligent in conducting overwatch fire.

Overwatch has changed, too. Space Marine Terminators are no longer required to fire when on overwatch. In practice, this will probably only mean that Terminators won't be shooting at closed doors (a nasty little trick that the Genestealer could do under 3rd edition - close a door while within LOS and hope that the Terminator's storm bolter jams), as well as when multiple Terminators on overwatch have LOS to the same Genestealer, allowing the Space Marine player to declare which of the Terminators will fire instead of all of them automatically firing. This change basically makes the Space Marines more intelligent in conducting overwatch fire.