Not really secret, but it’s fairly limited unless you’re subscribed. I mean, who’s going to see this pop-up at 1:06AM?
Anyway – here are some screen shots of the ships rendered in-game for the 1.4.1 patch. Two most visible changes: new/better/different shadow engine and 1080p where previously 720p.
Edit: I realise I have an international audience, which is awesome, so maybe more people will see this than I thought.