Hey bud. I bought a 15 two months ago and here are the differences I see. Also talked to forest river and there are no plans on releasing a new 15 brochure yet dunno why because there are allot of changes visually.
2000 watt inverter
Switched to furrion TVs and convection oven
Exterior color choices are different
Interior color choices are different
Some floor plans are the same but put different things I.E. Tvs and lights, windows in different spots.
The pattern of the hardwood looking floor is different.
The cockpit is redesigned. 15 have a engine cover console and better ledge slash cup holder for the drivers side. I have a 15 and this wasn't available on mine.
There is also a roller shade option now in 15. Again I have a 15 and this wasn't a option.
There is a different home theater so instead of it being in the dash it is located somewhere in the coach.
I really wish my 15 has the roller shade option ( 14's have a cockpit roller shades but now you can have them on all the windows). And I really like the new cockpit setup.
Here is a link that shows everything. It's a 351 since that's what I have and I could compare.
http://www.rvtrader.com/listing/2015...1DSF-113788428
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"MACK"
2006 F350 6.0 Diesel 3.73 4x4 FX4 "sold"
2010 Forest River Signature Ultra Lite "sold"
2010 Keystone Laredo 310RE 5th wheel "sold"
2015 Georgetown 351 "sold"
2016 Coachmen Sportscoach 404RB