Hi @Vegard S  
There will be more enablement coming out but what you should keep in mind is that there will be two new products coming with Rome. Employee Center and Employee Center pro. In terms of technology they are both built on the service Portal foundation so nothing new there. However they come with an additional set of widgets and capabilities.

The first consideration you should make is in the tier. to compare with current capabilities we map as follows:

Employee Center = Service Portal
Employee Center Pro = Employee Service Center

For example EC will have requests, IT tasks and knowledge but with EC pro you get access to advanced capabilities such as Employee to-dos, content publishing, ML driven personalisation, Campaigns and more. it also comes with the widgets previously delivered with Employee Service Center.

Outside of capabilities there is a new design and added widgets that support an enterprise wide employee centric design philosophy. It also looks much better if you ask me 😉

For any customer currently using Service Portal they should consider a portal migration to EC as it is designed to provide a better user experience. if your customer is already using Employee Service Center then they are entitled to EC Pro and have foundation in place so they can instead adopt the individual widgets onto their existing portal after evaluating which ones they find to be relevant. 

EC and EC pro will be a downloadable item from the ServiceNow Store soon.