The Devils uniform is based on an image put out by Adidas. The Rangers' accessories are an educated guess on my part. And I have no information on the Islanders as of yet. Remember, my site is not official; like you, I'm merely a common fan with no inside information.
For the Rangers, the red jerseys are the odd ones out. Rangers PR says the team will wear white and powder blue at home; gray and royal blue on the road. Red caps will still be worn on occasion at home.
I live near Fort Worth; and while it doesn't matter to me, many people in Arlington (and throughout Tarrant County) take great offense to their area being called "Dallas."