Rogues don't suck a dick anymore?
Sorta. Pre-gen is completely different. Better stats and a more useful speciality (You don't lose advantage against a creature if you start that turn hidden). It really feels like they want Rogues to engage in melee. Pre-gen doesn't start with a ranged weapon. The addition of schemes changes how a Rogue plays.
The Thug scheme gives you more ways to sneak attack and makes it more effective, but your less stealthy because of it. The starting one lets you do sneak attack damage if two or more allies are within reach of the target. Your also unable to be surprised while you can act.
The Thief scheme gives you better stealth and mobility. You get the normal hiding stuff, plus night vision and a way to escape after using your sneak attack.
So it's definitely better, but I wouldn't know how much without playing. I think reintroducing attacks of opportunity had a lot to do with how the game is going to play now.