I just wanted to clarify a few points about the patch preview video since there's been a lot of negative feedback due to a few things not being clear. As a note Phreak has pointed these things out but I thought it would be good to make a thread.
First, about mana regeneration. Nothing has really been taken away from a level 30 summoner with Meditation and yellow mp5 glyphs. We liked that approximate pacing for mana regen, but the difference between having that and not was simply too high, no matter how you look at it. Monetarily, Meditation was one of the best two masteries for your point (besides one pointers/gold medal masteries) - Strength of Spirit being the other. To be explicitly clear, Meditation lost 2 Mp5 total; all champions with mana gain 2.5 Mp5. Yellow and blue clarities now provide slightly less mana regeneration, but all champions have had their base regenerations per level incresed too. Only if you take yellows and blues will you see a slight loss in mp5, and only after around level 5 or so.
Another way to look at it is that it's not so much that we wanted to nerf mana regen runes/mastery, because we liked the amount of regen you had in that state. We didn't like the amount you had without those tools, so we buffed base mana regens substantially. But in that case, the amount of regen you had with those runes/mastery was too high, so they had to be reduced to make sure you couldn't get too much. So it's pretty much a breakeven now if you take them, and a win if you don't.
I think flat mana regeneration runes become a little stronger now too (off the top of my head you get around 15 mp5 base on most champions)
Doran's items were compensated in stats for their increase in cost, so it's not a net loss. Even though they don't build into anything, their extremely high stats per cost made them too much of a no-brainer. It still can be OK to start with them sometimes, and they are still effective to grab a couple of them on your first trip back. I think overall there will be a bit less health overall (if for example you choose Meki and 2 potions, you might be more likely to get Fort Quints, or if you have Veteran's Scars and Fort Quints you might feel OK about starting something else). But it's harder to have lots of starting health, mitigation, and tons of regen. The changes to Fort Quints and Veteran's Scars are pretty small.
Rammus is getting a small nerf to the effects of the Powerball slow as well as the fix to taunt cooldown.
I'll try to answer questions in the thread periodically as well if I can
Episode three of the Patch Preview series is up! Replacing Morello for this episode we have Guinsoo who’s also from the design team, and replacing Phreak we have Phreak with no voice thanks to a hockey game the night before the recording. Never fear, the content is as good as ever! Renekton, Rammus, and many more changes await us. Watch and learn!