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edit: Also, invisible enemies that you have to 'Paint' with the Paint-can props - either with the Gravity Gun or a Physics puzzle - so that you can see and kill them.
sound, occasional uncloaking, and knocking objects over are all things that show where the enemy is for a moment, but not long enough to get a bead on him
Perhaps, but if say, they had a cloak flicker that only cut in very rarely, the paint would be a very viable tactic as a more permanent marker of where your foe was.And if Valve gives hints as to where they are - ie. foot prints, shadows, cloak flickers, knocking objects over, etc - it would instantly nullify the need for 'painting' when you can just open fire on those visual cues.
The existing paint pots last forever.Besides what happens if you run out of paint? You die? Because thats a pretty lame game mechanic. "Cake or death?"
Explosives in an urban environment... I don't think that's going to be very good, because to be realistic you'd have to have some deformation effects, and I don't think Source is capable of that. RPG in HL3? That, I'd like.