When you upgrade your Zend Server CE 5.5 up to 5.6 than you will notice the featured content in the Zend Server Dashboard. It will show you all the features you could have had when you bought Zend Server (commercial or developer edition). This way they want to try to sell it to you, CE user.
It’s not really bothering me but Zend did make an option to disable the feature. Go to your dashboard, click on Administration and at the bottom you find the option Zend Server Feature Content. Set this option to no and you will only see those options that go with the CE version of Zend Server.