Preview shows that the Empire is now using Bike Scout Troopers. I guess Ezra will need to add one to his helmet collection.
Really old comics EU has Biggs and Hobbie jump ship together after they left the Academy. What is unclear is if Biggs jumped ship after he talked to Luke (in filmed scene) or if he half lied and had already done so by that point.
IIRC his dialogue states he just got his first commission and a group of others were planning to jump ship at the first opportunity. He mostly came back to say goodbye to his friends and family in case he never come back (which of course, he does not.)
Those friends could in theory have been part of the Yavin mission too, though since only Luke, Wedge and that one Y-Wing pilot made it back it's a little academic at this point.
On the other hand, if Rebels does follow up on Maul searching for Kenobi, we could still have an encounter with a Biggs Darklighter of Tatooine.
Not impossible, but that might seem a little too cute.
There was something ominous mentioned in the Rebels Recon about the Empire taking all these really bright young prodigy type students into the military (like Sabine, who said she was at the Academy for years) and that that will come out later in the season. Remember that Sabine is only a year or two older than Ezra and had a bounty hunter career of sorts after she left the Academy. Not only that, but she had some kind of serious training by her family and clan before that. She started really young. Since we know there is more Madalorian material coming this season via the trailers and this other knowledge (as well as it suggested that Katee Sackhoff will be back at Bo-Katan) means we should be getting a bunch of backstory and modern Madalorian materials later this season.
Aside from the stuff with Maul, this is what I'm most looking forward to this season. Right from the off I found Sabine to be a way more interesting character than Ezra and if they're doing what I think they're doing this could get *very* interesting.
As for what the Empire is up to with these prodigy kids: probably nothing as simple as elite troops. Clone templates perhaps? The first steps towards the type of indoctrinated troop and pilot training programs the First Order will adopt? Emperor's Hands would be a cool twist...I mean they don't *need* to be force users to be expert infiltrators, spies and assassins, no?
I don't watch Rebels, and haven't since the space whales. But, I'm going to keep up with what they're doing, because I love the SW universe and want to know what characters I like that the show is going to ruin. I have to keep up with the absolute worst part of the franchise, because it can effect the good parts of the SW Universe. So, yeah, while I won't be commenting on episodes when there is big news about formerly good SW characters I will probably comment on it. So, I won't be "buggering off". I'll stop posting about things the show does when it ends.
Please yourself sunshine, just note that the opinion of a person who doesn't even watch the show is less that useless here. So have fun registering your ill informed disgust to your own little echo chamber in the future.