I got curious about the ranged AD situation, so I went digging...
1. Sivir getting nerfed (not sure how). Mrm... I'll just toss this out. I don't really see her as a problem, as I barely ever see her played *right*. Most likely they'll hurt her ult and probably her W and Q. As long as it's not too big I can live with it. I don't mind if they reduce the movespeed too. But if they remove the attack speed from ult or take out too much damage from Q, then she's basically worthless. Let's hope it doesn't come to that. I don't really care too much about the others honestly. The spellshield could be on a 60 second cooldown for all I care. That's how often it gets used anyway. The W.... useful, but mrm... the AoE damage from it isn't particularly stunning by any stretch of the imagination. Hell, I only use it as a second autoattack. I won't shed any tears if that gets nerfed.
2. Ashe getting buffed. She's getting minor stat boosts here and there, a CD reduction on her W and mana regen buffs. Seems good. She was always quite weak in terms of base stats. I think this is more of a catching-up thing, than a boost-her-to-ungodly-levels thing. I'm still kinda wary about too much buffs to her though. It's been awhile since I've done it, but I would imagine her level 1 with say.... Leona... would still result in a free first blood. Especially if you run full AD like me. Not too sure CD reduction on her W helps in any way honestly. Who the hell spams that early game? Level 3 newbies?
I also seriously hope they do something about her craptastic E passive.
3. MF isn't getting changed.... yet. But Riot thinks that she's sort of a baseline and all other ranged ADs do too much damage. I'm going to put this out there. Heed my words. If Sivir gets nerfed, MF will take her place. Their playstyles are ridiculously similar. Sivir just has slightly more damage. You probably won't see it immediately, because of her cost and how everyone seems to think she does no damage (who the hell started this ridiculous idea? MF's damage is absurd.)
That's about all I found so far.