With the advent of the new Imperial Guard codex, tanks have a lot more options. The Hellhound has three variants, and the Leman Russ has six. Each kit comes with only one option (ie the box only has one kind of turret in it). Not for long. New kits for both are in the works.
What you see above is the new Hellhound kit, with all variants.
This incredibly versatile kit not only includes all the weapon options available to the Hellhound Flame Tank, but can also be built as either a Devil Dog or Bane Wolf.