Who are the next 4 2k3 TMNT figures?

 We only know that they're Toon Based, which could also mean Black and white First appearance variants AND 1987 Turtles are possible:

Thanks to Turtles Forever we have a crossover with the Prime Turtles a the 1987 Toon Turtles. I hate myself for saying this but I would most likely rebuy the 1987 turtles if they come with double jointed articulation from the 2k3 line.

But I don't see that happening any time soon. Maybe in 2029.

Now let's see: I sense 3 Shredder figures:

Shredder, Oroku Saki, and Utrom Shredder.

Or 4 if we count Karai dressed as Shredder... but I don't see this one coming so soon. 

I'm going to guess that either Saki or Utrom Shredder might be the first release. 

Another candidate would be Master Splinter. This would make so much sense. 

Casey Jones is a Logical Choice... That I'm not looking for To Upgrade Nick R.Cade... not at all.

April is another logical choice...

But those 4 are the obvious "safe choices"...

As DW just said, Let's get Dangerous!

Foot Ninja, obvious and safe...

Hun... he's a big boi... errs on the safe side.

It's too early for the Justice Force, but 1 Additional Member may show up if a Turtle Titan Figure is made.

Bishop is semi safe. I'd buy him in a flash!

Baxter is complicated:

He got the most changes throughout the series. Honestly, gimme a first appearance Baxter first, then the other versions. I most definitely want the brain in a jar version and one inside a robotic body...

Slayer/Rat King is a semi safe option... I'm sensing a pattern here.

I want a Dr. Chaplin... AFTER we get Baxter, of course...

2k3 was very sparse in the Mutants area... most of its characters were humans. Or humanoid shape. 

Sure, we have the Shredder clones but they shouldn't come out before we get a Shredder.

So who do I pick for 2k3 wave 2?

Shredder

Splinter

Foot Ninja

April

Wave 3 would have to be

Casey

Hun

Bishop

Baxter

Sadly, I don't see 2k3 going over 5 waves.