Unfortunately that is a question we all want answering too. We know the
Cupra is specified as 240 hp , some of the engine layout does look similar to the S3 engine, pipework etc. But we dont as yet know, which turbo its using.
The hope is its a detuned K04 which would make it capable of upto 300hp, otherwise its K03 version, which tuned won't be much more than the FR or Golf GTI, its unlike VW/Audi to push components too close to their maximums, and for it to be a racier fast car, the K04 makes more sense.
But we can only wait and see, until someone physically can look under the bonnet and see, were all a bit in the dark.