I know people are slamming this idea, but a prequel concept that explores how the Matrix was really started - that sounds super interesting to me. The ethical and moral issues in the first film are neat and part of thousands of intro philosophy classes across America. There is potential for a good story there that doesn't become a Hollywood hackfest. . .
But it probably won't. It'll be a dumb money grab pulling nostalgia dollars from early 40-somethings.