-Talk about how awesome the content will be in the future
-Have an excited tone
-Add a smidgen of a hint of what is to come, or pretend to tell everything but really leave most unanswered.
-"We are very excited about..."

Thats the secret behind any propaganda, salesman at an electronics store, or TV commercial ever.

We are very excited to announce the we will be implementing the changes to the current mechanics some time soon. The changes will allow further incentives for particular aspects that affect how the the players go about their business so that eventually we're able to give EVERYONE full benefits of the update in the future. Mistakes will be/are being made as the project is still in development and we're working on broadening our sources to gain ample feedback about any glitches that may arrive when the update comes into full effect which should come once we have properly resourced the game for a more convenient, less redundant approach.

We're very excited about giving all our players the chance to participate in what we believe to be an integral part of the game and to see how it affects the players in achieving their objectives. Although it may be a significant change in the way the players managed their affairs, it does not take long to master it fully and players will be able to reap the benefits in no time. Thank you everyone for your patience!

Don't forget to critcize other game developers about rehashing content and failing to let their franchises evolve whilst only recycling existing content for your own game and marketing it as "new".