Thought I'd start this so perhaps we could all get on the same page regarding the new card and how it will interact with other things.
In the article it mentioned that Stay on Target's changing the maneuver to Red wouldn't be changed by R2 Astro. The reason for this (and if I'm wrong I'm sure the regulars here will correct me.) is because of this ruling from the FAQ.
Q:If two or more game effects that change the difficulty of a maneuver conflict, which effect takes priority?
A:An effect that increases the difficulty of a maneuver takes priority over an effect that decreases the difficulty. For example, if a ship equipped with R2 Astromech is dealt the Damaged Engine Damage card, all of the ship’s turn maneuvers are treated as red maneuvers, including the 1-speed and 2-speed turn maneuvers.
Here's the key to that all. Damaged Engines changes the difficulty of the maneuver. The ruling means that if an effect increases the difficulty say from green to white, or white to red, or even green to red, then an effect that would make the difficulty lower doesn't go into effect, because the increase takes priory over the decrease.
Some people have tried to use that to mean a negative effect trumps a positive one. But that isn't how the rule works, it only applies to maneuvers and difficulty.
The reason R2 Astro makes the 1 straight from being Ion'ed green is because the Ion effect does not change the difficulty, it simply states what the maneuver you must take is. Some people seem to be confused by this, and think the R2 Astro FAQ is semi-contradictory, because they seem to have the assumption that Ion is changing the difficulty from green to white. But again that's not what is really happening.
Since Stay on Target changes the difficulty of maneuvers to red, then R2 Astro can once again not change it, due to that rule.
The reason why Navigator does work with Stay on Target as the card is currently worded. Is because Navigator doesn't change the difficulty of the maneuver, it changes the maneuver itself. So the maneuver that was a red left bank 2 because of SoT is changed into a white right bank 2 by Navigator.