anyone heard of new tech for boats to save fuel?

Just curious if anyone has an inside scoop on any new technology that might be a fuel savings for boats in the near future. I know that it was the boating industry in the 70's that started fuel injection. automotive might have invented it, but it was marine that pushed it first. So I am wondering if the same will happen with fuel cells, or diesel hybrids. Etc. etc. Post it but don't put yourself in trouble if it is sensitive information. THX!