This rumor is pretty solid. It surfaced when a Turkish game site leaked that they had an appointment to see the game. This comes in the wake of the developer, Creative Assemblies confirming they are announcing a new game at E3.
I am sure many of the console only gamers are not that interested in this, however I am very interested. Shogun was the real start of the Total War series and going back and making a sequel rather then moving foward in the timeline may seem strange, but they have been getting lots of backlash for Napoleon: Total War for the lack of melee combat.
I personally like guns the best and would prefer my war games have them, but I do have some very close friends that felt totally put off by the direction they took with both Napoleon and Empire.