According to C/D, the XE's engine bay has been designed to accommodate the company's ubiquitous 5.0-liter V8 engine, which in the larger XF is offered in several states of tune, including the XF Supercharged with 470 horsepower, the XFR with 510 hp and the flagship XFR-S with 550 hp.
Just which version (or versions) would be offered in the XE remains to be seen, but even in its lowest-spec supercharged form, the 470-hp version would already be enough to challenge the 425-hp BMW M3 and the base 469-hp version of the new Mercedes-AMG C63. If Jaguar wants to take on the C63 S, however, it will need to shoehorn in one of the more powerful versions.
In the end, Coventry's new Special Vehicle Operations division may opt to offer two versions, like it does with the XFR and XFR-S. Expect the top version, however much muscle it packs, to wear the British automaker's new SVR badge. It just may take a few years before it does so.