I do remember this from the podcast. I don't think they should have both in multiplayer personally, they need to pick one and that needs to be the assassination. Otherwise, it doesn't make sense to have both cause one leaves you vulnerable and the only plus to doing it is it looks cool.
Also of note on assassinations, they said that assassinations will be different based on where you are standing (directly behind, left-behind/right-behind) and that they were adding unique assassination animations for each of the different guns in the game.