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Euphoria is a game engine. I'm assuming they are considering using it or parts of it for Abe HD. It can do pretty neat things.
Gratuity as I know it is a form of tipping and in games it's a term used to reward people with certain items, often for participating in Beta's or other tests. Maybe they plan on some ingame reward for those playtesting or something?
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Euphoria game engine is used in GTA IV