I've heard that most manufacturers understate what the engine is capable of, so most engines should be able to safely handle a higher power output without affecting reliability too much if at all. But we'll just have to wait and see, though information is scarce these days.
Also looking forward to hidden Easter eggs from Jaguar.
what an engine can actual handle can vary quite a bit because i have seen engines with a strong block and bottom end that can handle a big jump in percentage of power then on the flip side there are engines that are only safe with a very small percentage increase in power. in the end you have to be very methodical about it and do your research.