This post has a lot of the links, it is missing some people's job videos though(for example Mr Happy has a video for every job) but good stuff if you want to see some specific stuff like the 2 dyes channel video.
Edit: Finished watching every job video, seems the leaks I had seen were accurate although a few things were missing.
Overall the expansion job changes can be summed up as "more of the same", where almost every class is almost exactly the same as EW versions but with like 1 or 2 big GCD/oGCD added every 2mins which often don't actually impact the rotation in any meaningful way. That's both good and bad I'd say, depending on whether you like the class or not. For example a lot of ppl didn't like the oversimplification of Summoner with EW, and the changes do absolutely nothing to change that, it's exactly the same job after the changes with one more oGCD every 2mins. Ppl who hated SMN changes will still hate SMN and ppl who liked it(like me, I like how braindead it is) will probably be kinda happy.
Having seen the changes and stuff for sure, I'm pretty confident going Pictomancer now, it looks really neat. I'll still be getting Scholar(the new 100 ability is pretty funny cause it suddenly makes Scholar who was often the "worst" at dealing with massive healing requirements probably the best, but is otherwise pretty fucking useless other than as a 3min aoe regen) and Warrior(same job, just more self healing and more ungabunga big damage, perfect) as a followup. Kinda interested in Black Mage and Monk changes too. Viper looks extremely meh to me and I think I'm just gonna level that last or close to.