In the new PS4 Reveal Trailer theres a small preview for a new Hero Ship.
The ship is using siege mode, so im pretty sure this is an artillery cruiser. The Nox already has its hero ship skin and the Svarog is a lot bulkier, rounder and has its bridge asymmetrical to the right. The smaller frame of the Grenada and its sleek military look fit quite nicely into this new skin. The energy effects on those 4 arms are very noticeable and will probably activate on module activation or when you divert energy to weapons.
That's a tier 4 Grenada.
We kinda need a new hero ship now.
The "quad arm" deployment mode is a signature feature of the Jupiter Artillery Cruiser(commonly: "Grenada").
I confess I'm not intimately familiar enough to realize that it was a hero ship instead of just a variant thereof.
As a side note, I do feel that it's worth noting that the Akula Dreadnought does already have atleast two hero variants - the Morningstar and this(I forget if it's called the Ravenwood or Ravencrest):