Allpar is reporting that updates are incoming to the HEMI engine lineup, but likely after the 2016 model year according to sources. Details as to what the updates include are unknown at this time, but direct injection is a likely one. The delay is due to resources being somewhat limited. No word as to what vehicle will get the HEMI first.
There are also changes in store for the Hellcat as well. Allpar says the Hellcat is being tuned to have a bit more refinement in the Grand Cherokee as to match the character of the SUV and buyer. A reduction in power is possible. The other change is for more power that could be arriving in 2017.