It looks like the next generation gunship is going to be based on a bomber, and not a transport aircraft like the C-130 pictured below. Amy Butler of Aviation Week & Space Technology has an excellent article on what the future gunship may look like, and the most interesting part is that it won't look much like today's gunship:
Requirements for the Air Combat Command’s (ACC’s) bomber and the gunship are still being drawn up. But, both commands agree on some key characteristics: a degree of low observability (LO)—not necessarily full stealth—and endurance. The future gunship will look nothing like today’s lumbering platform, and it could actually wind up appearing more like a B-2. “I don’t think the transport next-generation gunship will be on a mobility platform because you are not going to need to carry around all that weight,” says Lt. Gen. Michael Wooley, outgoing Afsoc commander. “If you are not carrying around that big gun and all of that heavy ammunition you don’t need a big [transport] that is in itself vulnerable.” Wooley will be replaced by his current vice commander, Maj. Gen. Donald Wurster, later this year.
ACC has announced it will not push the state-of-the-art for its next-generation bomber, which must be fielded beginning in 2018. That time frame and limited funding are prompting the Air Force to scale back earlier aspirations for a highly stealthy platform equipped with exotic directed-energy weapons. Afsoc has traditionally latched onto the Air Force’s larger buys when procuring a platform in order to prevent having to dedicate funding to a separate development project.
Like the direction in the next-generation bomber, it looks like the future gunship is likely to be manned (though unmanned options are still being considered):
