The use of road maps to illustrate technology plans is fairly widespread. Whether it's a vendor explaining its product plans or a technology architect showing the evolution of a particular area of the infrastructure, road maps are great for communicating what happens when. And when plans as illustrated by the road map get sign-off, they can become a useful tool in change management as well. Someone wants your key resources for a special project? Fine, but all the dates on that road map they just approved just shifted six months to the right. Road maps tell the story of what to expect an organization to accomplish for the foreseeable future, and that's what makes them powerful.
That's why road maps that link traditionally difficult-to-explain areas of technology, such as those related to information management, to specific and highly desirable business outcomes can be a major win for architects looking to communicate what they're doing and why. There's always been a Catch-22 about explaining the value of complex technologies to audiences with no appetite for technical complexity -- but with needed sign-off authority for key resources (like funding). If the EA team has credibility (OK, that can be a big "if"), just showing the interrelationships between business outcomes, business capabilities, IT projects, and required activities in the various EA domains can satisfy the need for "explaining" that complex technology. Or for explaining the need for that not-well-understood architecture process that requires business involvement, such as information architecture development or governance.