Alright, so the proof part is a bit shakey...
The Decimator Dial is labeled SWX24 while the highest labeled dial in Wave 4 was SWX19 (Phantom).
The CR90 was labeled SWX22, so everything hasn't been in perfect order to this point, but we've got 20 ships including Wave 5 (I think my count is right) and 24 dials.
So we've got 4 ships possibly unaccounted for. This could be 2 W5 + 2 Huge or a big box 3rd faction (I tend to disagree with this, but the art on some of the new cards like Lone Wolf and Intimidate seem to support the theory...), or just Wave 6.
Or the dials are out of order due to the manufacturing and development process...
We'll find out this weekend, but I thought I'd do my part to fuel the fire.