I share nostrademons's interpretation. I'd expect the first page rendered on the server and the rest rendered on the client in any isomorphic framework. When I hear "transitions", I expect elements morphing between assets, ala neon-animated-pages:

https://elements.polymer-project.org/elements/neon-animation...

I think your value proposition is something like: "Renders on the server or the client - whichever's fastest for that request"