Vijay Govindarajan and Jatin Desai in their HBR blog Recognize Intrapreneurs before they leave talk about finding and keeping the intrapreneurs. They talk about these people who are forward thinkers and are always thinking in the future.
They also talk about 6 patterns that they have observed of Intrapreneurs and these should help you identify them in your organization and also tell you what they are looking for.
My opinion – Intrapreneurs are the biggest wasted resource in most organizations. No one knows your business like you and your colleagues do as you deal with the problems and opportunities on a day to day basis. You deal with the clients and know what they are looking for, what they are happy about and what is the next need that you can potentially address. To not tap into the minds of people who have ideas for business is an opportunity loss. Employees with a business bent of mind and a vision of future and an execution ability are your best bets for innovation. All they need is recognition and nurturing, may be a platform that lets them experiment.