The only engine technology I've seen that has any hope to significantly impact outboard design is the scuderi engine but I won't hold my breath for its introduction anytime soon. Seems like they've been relegated to power generation vice propulsion as I image adoption into the automotive world is not a easy feat.
http://www.scuderigroup.com/engine-development/
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74 V20 CC with a 150 Johnson (Gone but not forgotten)
89 V20 Cutty with a Tower (Build in process)
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