The first kit, the Necrosphinx/Warsphinx. This is the Necrosphinx, and I love this model.
Here is the Warsphinx. It can have Tomb Guard in it, or it can be a mount for a Tomb King!
There is also the Necropolis Knights/Sepulchral Stalkers kit. Both of these are awesome. The Necropolis Knights are Monstrous Calvary with 5 attacks, 3 poisoned and 2 with Killing Blow! The stalkers are underground burrowers from what I understand.
And lastly, but not least, new Tomb Guard. They can be equipped with Halberds.
This will be a very cool looking army! I cannot wait.
Games Workshop has also release the first new Tomb Kings Article, Tomb Kings: Getting Started that has some cool info in it.