With lots of new upgrade cards that are cross faction being bundled into releases due out soon, we are still awaiting any news on the promised card packs.
The thing is, they'll might add some other stuff to make them more appealing, here's my thoughts on possible direction for them.
1. Some ships still require extra pilots (BWs etc) and the 2nd ed version hasn't changed this. Maybe make each card pack faction specific, throw in a few extra pilots. You'd need to include the cardboard ship base but not the dials (they're giving you new ship options, not extra ships).
2. Include some standard extra cards - force power cards, ordnance etc along with multiple copies of the new cards.
3. Maybe a couple if small boards for extra tokens such as the dust clouds and bombs etc.
They probably won't do any if this but we can still speculate.