Well as far as i know arianos is working on his tool and from what i read and see i can export fifa15 stads to fifa 14 and i guess it will be the same with fifa14 to fifa15.

So far i only play fifa15 on ps4 no need to get fifa15 for pc till there aren't any tools to mod it. But anyway the people who have fifa15 on pc could try to mod it a bit. For example you all have great Villa Park from our dear Niklas you can try to replace it with the one Fifa15 has with fifaexplorer and check it works.

I am pretty sure that the stadium files haven't changed, so trying to check if they work it won't cost much