I saw Vikram Subramanian speak on prerendering at the AngularMix conference.

Sometimes there will be the need for server-side rendering to make a fast initial paint of a web page snappy. Rob Wormald spoke to how this is really not in Angular's sweet spot in his talk. This sort of thing really breaks the SPA model. BrowserModule.withServerTransition is a way to attempt to get around the problem. The Domino server was mentioned in this talk. It provides a good enough DOM API to let you fake the DOM at the server to build up UI stuff there that you would then barf up to the front end.