"With regard to caps for data, the general approach introduces a declining glidepath, with the maximum charge starting from €0.01/MB on in mid-2017 and dropping gradually to €0.005/MB in mid-2021."
So if I understand right, when I use 1GB of data on my roaming trip next summer, my operator might end up paying 10€ for the local operator, but is not allowed to transfer the cost to me.
I don't really see how this can work out, unless there will be quite heavy data caps for the free roaming.
[1] http://www.consilium.europa.eu/en/press/press-releases/2016/...
If I messed with my antenna setup a bit I could maybe get the speeds closer to 600mbit than the current ~100.
If it worked as well abroad that'd be amazing, but I'm sure the carriers will come up with some schemes to prevent that.