After it was leaked by retailers earlier today, Bungie confirmed that the Suros Arsenal Pack will be offered as a pre-order bonus for Destiny: The Taken King, regardless of which version you purchase.
Available worldwide on September 15 to everyone who pre-orders (and who already pre-ordered) Destiny: The Taken King either physically or digitally, including the $39.99, $59.99, and $79.99 editions of the game, the Suros Arsenal Pack will also be attainable through regular gameplay beginning on January 1, 2016.
As you can see in the above image posted on Reddit, the Suros Arsenal Pack includes a Suros Foundry-themed Auto Rifle, Pulse Rifle, Scout Rifle, Emblem, and Armor Shader.
Additionally, pre-orders of The Taken King come with early access to the Vanguard Weapons Pack, which includes a Vanguard-themed Auto Rifle, Pulse Rifle, and Sidearm. Everyone else can access this content beginning on January 1, 2016.
Destiny: The Taken King releases on September 15 for the PlayStation 4, PlayStation 3, Xbox One, and Xbox 360. A Limited Edition PS4 bundle will be available on day one.