Does anyone know the rules yet for priority supplies or apps that will make my games better?

The Battle Cards that come in Priority Supplies are all shown in the preview article.

https://www.fantasyflightgames.com/en/news/2018/3/9/fortify-your-battlefield/

As for apps, define what you mean by "make your game better".

The best app for Star Wars Legion is your phone’s music app.

Place thematic Star Wars soundtrack on it, and then play it while your game is going. Note — this only works at home/friends home. Do not attempt at FLGS

1 minute ago, ScummyRebel said:

The best app for Star Wars Legion is your phone’s music app.

Place thematic Star Wars soundtrack on it, and then play it while your game is going. Note — this only works at home/friends home. Do not attempt at FLGS

37 minutes ago, ScummyRebel said:

The best app for Star Wars Legion is your phone’s music app.

Place thematic Star Wars soundtrack on it, and then play it while your game is going. Note — this only works at home/friends home. Do not attempt at FLGS

Yeah, best at the FLGS to convince the employees to play the soundtrack over the sound system. ?

11 minutes ago, Caimheul1313 said:

Yeah, best at the FLGS to convince the employees to play the soundtrack over the sound system. ?

Only if they don't have a stream going. In that case, the program they are using to stream may block the feed due to licensing issues.

As far as apps, something like Battlescribe or another list builder is about it. Nothing that makes "playing" the game better/easier.

5 hours ago, ScummyRebel said:

The best app for Star Wars Legion is your phone’s music app.

Place thematic Star Wars soundtrack on it, and then play it while your game is going. Note — this only works at home/friends home. Do not attempt at FLGS

Agreed. I have an hour-long recording of my ex-wife crying that I always like to play while my opponents are taking their move but the FLGS staff really frown on it.