Cummins has already announced the new B-series engine - it's coming. New emissions standards go into effect for January 1 2017, which is why you also see revised Powerstroke and Duramax engines. But you have to understand one loophole that EPA allows for meeting emissions. If the engine build date is before an emissions change, a vehicle manufacturer can still use the engine after the new emission-regs date. In other words, FCA can continue to build Rams with the current (2013-emissions) engine as long as the engines are built no later than December 31 2016. As long as FCA has sufficient stock of those engines, they can keep using them... and FCA may have very well requested a stockpile from Cummins to complete the 2017 model run. But at some point next year, FCA will begin to install the new 2017-spec B6.7 (no longer ISB6.7).
The question isn't really about a new engine. Ford and GM offer the same maximum hp/tq rating over all their HD pickups... F-250 through F-450 get the same 440/925 Powerstroke, 2500-3500 GM trucks get the same 445/915 rating. FCA of course has three ratings based on transmission and the max rating is only available with an optional transmission and only on the 3500. They need to do something about that or risk sales, particularly in the 3/4-ton market... if the 68RFE is the best Ram is willing to offer in the 2500 and remains limited to 800 lb-ft, people who want power will go to the other guys. And no one wants additional torque management to choke off the drivetrain just for bragging rights of engine numbers. Cummins would probably say "Yeah, we can do 950 - do you have a transmission that can properly handle it?"
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