Re: **NEW**4.8 V8 Pentastar based engine for next gen WK(2015-16)?
Personally, I don't think the 5.7L and 6.4L have much life left in them. GM has remained successful with the pushrod V8, but they've dedicated the time and R&D money over the years to improve the LT and LS mills. They're also not foreign owned. With Fiat controlling the purse strings, and certainly wanting to share powertrain tech across its holdings, I believe that Maserati's engines will replace the Hemi's and Pentastar's, or at least a new engine will be shared amongst them. Any shared engine though will be more Italian than American V8. Actually, looking at the engines in the Levante would probably be your best bet to see what the next gen GC will be powered by.
2015 GC Altitude
2010 Mazda 6 (wifes)
2008 Suzuki B-King (Gor-Gor the Decepticon)
2003 Yamaha V-Max (The Heretic)