So let's see here we have ion turret, ion cannon, ion pulse missile and now ion torpedo. Any guesses on what it will do? My guess is it places an ion token on huge ships and does 2 damage to smaller ships instead of 1? Something like that I'm assuming. Some way of neutralizing huge ships with 1 shot maybe.

I have a feeling they might be the reverse of Ion Missiles: They do 2 damage automatically, but assign 1 Ion token. They come with the Decimator, and the decimator only comes with 1 Ion Token, whereas packs with Ion Pulse Missiles came with 2 tokens.

They also couldn't be used with Blount for instant double damage.

They may also simply include the more standard torpedo mechanic of either flipping a number of blanks to focus or a focus into a hit, at the cost of dealing out one fewer ion token.

Well torpedoes would normally inflict more damage than a missile, so my guess would be 2 damage.