We could be looking too much into this, or it could actually be the Lumia 900 being featured on Nokia's Pulse webpage. Looking at the above screen capture does reveal some notable differentiation when compared to the Lumia 800. The capacitive buttons are closer to the edge of the handset, it looks marginally taller, but no FFC can be spotted. We'll pass it onto you guys to decide, an interesting find nonetheless. This is -of course- running off the "modified 800" render rumour, but it could well be the "Ace".
Whatever the above is, we'll see the launch of Nokia's U.S. Windows Phone at CES.
Source: Nokia, thanks Jack for the tip!