I think the recent serge in sales has given the Durango a new lease on life.
I also don't think it necessarily means the Grand Wagoner won't happen now, I suspect the GW, will still make it to production and will be built right along side the Durango for a while. If it does turn out to knock the wind out of the D's sales, I suppose that's when they will decided to rather kill off D.
If they both are selling well, I highly suspect they will be keeping both. I have noticed over the past couple years, that this Fiat bunch are a lot smarter then anyone ever thought. Fiat seems to be making all the right moves lately and you see it the press accolades all the awards and such and the sales reports are proving it.
If the public is asking for it, these guys are paying attention and bringing it to market. The Diesel 1/2 ton is one example of that. The ZF8 speed auto across most of their product lines is another.
As far as 2015's, Chrysler R&D spent some bucks refreshing the 2014, there is no way they would kill it after only one year, especially after investing the money in it's refresh and sales way up to boot.
Right now I am just really curious if the 15 Ds getting the Turbo Diesel added to it's option list. I had noticed that inside my fuel door of my new 14 Durango that there is a suspicious amount of space off to one side, almost just the right amount of space for DEF filler port.