Yep, I don't think the logo is evidence of Akaviri involvement at all. This isn't to say they can't also be involved but I'm guessing that's the Imperial icon we're seeing, not something Akaviri.
Unless the two events are connected I wouldn't expect the game to involve dragons re-emerging and a coincidental invading Akaviri army.
They are very connected, Tosk Raka leader of the Ka Po' Tun (Tiger-like people) of the Akavir continent, was the first to be able to turn into a dragon (the dragons were extinct at the time thanks to the very destructive war between the Ka Po' Tun and the Tsaesci), and his plan was to kill the Tsaesci and to invade Tamriel...
And the logo is not the Tiber Empire Logo is the Empire Logo (Duh!!), what I mean is that Reman Cyrodiil was the forger of the empire, not a Septim, and from his alliance with the Tsaesci The Blades were born, and there are rumors that the logo of the empire was an old Akavir simbol....