As Blibawotsit said, do quests on Makeb if you find yourself short of lv 50 at the end of a class storyline. I went from 49 to 50 just by completing the first quest. I imagine you'd only need to do 2 or 3 to hit 50.
Thanks. I don't think I'll be doing them during 12x though. I want to do the other class stories first. (Plus I'm too lazy to relearn everything at a fast pace at level 47/50 in order to do those ~level 50 quests, whereas starting a fresh character gives me time to get used to the class). Hopefully the streamlining will be not significantly more grindy than the current system. Sounds like it'll just be 1/2 the speed. And actually it might be a good thing because it's easy to outlevel your gear. Well, for me, I've learned to use the referral red "space gear" and continually mod it with commendations (usually just weapon/helm/chest/legs) every planet or so. And then I use a nice outfit to cover it up.
Currently I'm not terribly fond of the Arsenal Merc. I would like a ranged character with instants (and not depend on cover). Course that tends to be overpowered since that makes a stupidly powerful kiting class. So I'll try a IO Merc. If that doesn't work out, I'm gonna go back to the Powertech.
I'm not liking Gunslinger for the same reasons for Arsenal Merc. Ambivalent about Saboteur... seems like too many abilities to keep track of during regular leveling. I understand it's important to be good at rotations/priority in the endgame, but for leveling I'd rather it be not that much. I may try Dirty Fighting. If not, I will make a Ruffian Scoundrel. That's the one that relies on DoTs, has a bit more range, and relies less on stealth. The main reason I'd pick that Discipline is because my level 47 is a very stealthy Operative.
I'm definitely enjoying the Scoundrel storyline just because, well, it's not that straightforward. Thus I'm going to play a Scoundrel even if I'm forced to play an Operative mirror. Sith Warrior, I'm going to play also, just because it seems very well written. Bounty Hunter I will continue playing... it seems too straightforward right now, but mechanics are interesting. Consular, I'm holding on the hope that it gets better after Chapter 1, with more manipulation behind the scenes (which the INQUISITOR SHOULD HAVE BEEN LIKE). Plus it seems like a lot of the criticism of the Consular is because it's not "action-packed" and "cinematic" and "visceral." Whatever. I also made him look like Superboy/Superman because Nolan North VAed both in Young Justice. Body Type 3 works really well with that... (Actually I always use Body 3 for males because Body 2 is just way too skinny. Body 3 I can agree is still unrealistic, but...not to the same degree).
Oh, and pics of my launch Assassin and 2 years later Operative: