Hi! We've had E10 95RON in Hungary for about 2 years now, and we came across the same things to worry about. As we say it here, the smoke was bigger, than the flame. Yes, some older cars, even some european models from the early to mid 90's are affected, but any car or motorcycle after that should have no trouble. I use E10 95RON in my EP3, and my Daytona 675 as well, which has a compression ratio of 12,65:1, so the fuel can definately take it. As some have stated, ethanol has a higher RON value than petrol, so E10 95RON could be called 95+ even, the higher the ethanol ratio, the higher the RON value. In this regard, it's even better for high pressure, modern turbo engines, than regaular 95RON petrol. Caloric values are indeed a bit lower, but to be honest I haven't seen a noticable drop in fuel economy.
All in all, the way this is presented makes a huge fuss, when in reality it's absolutely nothing to worry about, you won't even notice it. Even the EP3 has a knock sensor, and with the super smart ECUs of FK2s and FK8s, the change is absolutely nothing to worry about. Higher octane value, worse fuel economy, but the difference is so miniscule (if we look at the numbers, pure ethanol and petrol have very similar values to begin with, and we are adding 5% more ethanol), that no average person will notice it. Maybe some fanatics will, who calculate their fuel economy down to 3 digits, but noone else.
We still have 100RON premium petrol, which is E5 (even 95RON premium E5 in a few places), so if someone is worried, they can use those. But in the end, the only noticable change will be, that it says E10 instead of E5 on the pump.