Ok so you'll have to bear with me for this as this is a lot of speculation about future expansions and what they could contain based on the "Homecoming" Side Quest and Luke Skywalker himself.
So first of all we know that the time period of this campaign is 3, the Homecoming Side Quest can only be played during time periods 3-4. This makes me assume a couple of things, about Luke Skywalker and the nature of time period 4.
Ok, so we also know that this game takes place post the events at the end of Episode 4, placing it between the battle of Yavin (obviously ) and the battle of Hoth in Episode 5. Now during this time period we have a Luke Skywalker who is very inexperienced with his lightsabre and thus we get a Luke with a default ranged attack with a simple sabre strike ability. We also know that Luke stays this way (inexperienced in lightsabre combat) until he starts his training with Yoda on Degobah.
So through a lot of extrapolating and jumping to conclusions I think it is safe to assume that the next proper campaign (big box expansion) will be based on Hoth, in time period 4, where we still can use/gain a Luke that is blaster focused. (We'll probably see a little box expansion based on Bespin/Cloud City)
Okay so that's the first big assumption, now onto round 2.
We know that Luke does become more proficient in lightsabre combat, even besting Vader at the end of Jedi. So my second conclusion is thus - we will get a second Luke Skywalker at some point, the one with his green lightsabre and greater mastery of the force and I suspect he will be available for time periods 5-7 (7 being the latest I could find listed on a card "Celebration" & "The Spice Job" respectively).
So what do you guys think? I'm probably jumping to to many conclusions but it's fun nonetheless.
Thanks for reading, LeighPouse