I prefer easywdw.com over touringplans.com. I've found them mostly accurate (no calendar will ever be 100%). I want the information and recommendations Josh provides in his day by day explanations.
As for upcoming changes in the parks this year, all of the calendars do updates to each month, as necessary, as soon as they are officially announced. Given Disney's habit of frequently changing park hours, etc, it is common sense to make tentative plans early on, with the understanding that you need to recheck the calendars occasionally to see what, if any, changes may have occurred that may alter park recommendations.