service objects

application.js

import Ember from 'ember'
var ApplicationController = Ember.Controller.extend({
  settings: Ember.inject.service(),
  updateCurrentPath: funtion(){
    this.set('settings.currentPath', this.get("currentPath") );
  }.observes("currentPath")
  
export default ApplicationController;

campaigns.hbs

{{#if onNew}}
  <!--add some content for the new route -->
{{else}}
  <!--add some content for campaigns route that you dont want on the new route. -->
{{/if}}

campaigns.js

import Ember from 'ember'

var CampaignsController = Ember.ArrayController.extend({
  settings: Ember.inject.service(),
  onNew: function(){
    // checking if we are on campaigns/new route
    if (this.get("settings.currentPath").indexOf("new") > -1){
      return true
    }
  }.property('settings.currentPath')
})

settings.js

import Ember from 'ember'
var SettingsService = Ember.Object.extend({
  currentPath: 'null'
})
export default SettingsService;