What they plan and what actually happens isn't always the same thing as things change. The FFXI team would post roadmaps but all it did was create disappointment as time frames changed throughout the year and content changed and moved. The way the MMO community in general is...anything said about future content/release content would be taken as gospel and the rants would never end when the Devs don't deliver for whatever reason. Therefore best practice is not to announce anything not set in stone.