This might be the Hellcat-power Trackhawk or a styling upgrade for the SRT.
Jeep has a hardcore Grand Cherokee Trackhawk under development with the supercharged 6.2-liter Hellcat V8, and we can't wait to see it. These spy shots suggest the brand might soon have updates for the SUV's naturally aspirated SRT model, too. While these photos could show the undisguised Trackhawk, some clues hint otherwise.
A lack of exterior changes is one of the biggest sign that this might not be the supercharged Grand Cherokee. For example, the only major change to this test vehicle is the new front end. The design here features a narrower grille with extra inlets in the bumper. There's also a wider intake in the lower fascia and new LED running lights at each corner. The updated styling looks great but appears too subdued for the Hellcat. If this were the Trackhawk, we'd expect more aggressive additions, including a prominent hood scoop like on the supercharged Challenger and Charger.
Jeep's product strategy also suggests this is the Hemi-powered SRT. According to division boss Mike Manley, the Trackhawk arrives in July 2017, but this SUV looks ready to go on sale right now. As further evidence, the Grand Cherokee SRT is due for exterior upgrades soon. The model received slightly more power for the 2015 model year and an improved interior for 2016. In fact, we've seen this body style in development for several months.
Until Jeep makes an official announcement, we can't be entirely certain about which engine this Grand Cherokee has under the hood. However, the evidence here doesn't point strongly towards the Hellcat.