I'm always up for adding items with new mechanics that can enhance some style of play! There are still yet more in the plans, aimed at various play styles, but any remaining ideas will mostly be left for post-1.0 updates.
Regarding the new stealth items, I'll say now that because it's probably OP the Triangulator won't be such a common find (and it doesn't appear until -5), and no other robots carry it, so the best way to get one would be to fabricate it.
As for the Cloaking Devices, they too currently don't start appearing until -5, and only one type of robot uses them, so you'll probably want to fab those as well
(This pair of items add so much additional potential to stealth, especially in combination with one another, that they can't be too easy to get or appear too early!)