Chris Avellone tweets about disguises:

In FNV? Depends solely on what units spot you (dogs and lieutenants) - rank and file won't notice anything wrong.[..]Sneak only affects if the "sniffers" (dogs and lieutenants) can spot you if you're sneaking, no passive impacts on disguise.'

J.E. Sawyer posts about the slow motion killcam:

It isn't seen after every kill and it's optional. I believe it is only triggered when you kill the last hostile within range. So if you're in an extended firefight, it's not going to go off until the last target drops.
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