Righto, I was off-by-one on that, thanks :). We're currently transitioning to Qt 5.2 which involved upstreaming lots of things we need in there, so it's become a mental habit to think of anything shiny we're using as being new in 5.2.
So far we consider Controls to be very promising, but there's plenty of gaps (no form layouts, incomplete QStyle support, some pathological performance problems, lacking automatic keyboard accelerator management, plain missing standard widgets, etc.) that don't quite make it stand up in comparison if you're serious about desktop use (which we are), so I think it best not to overpromise.
We're making quite an investment into the technology anyhow, though; it'll get there with time (and effort).
So far we consider Controls to be very promising, but there's plenty of gaps (no form layouts, incomplete QStyle support, some pathological performance problems, lacking automatic keyboard accelerator management, plain missing standard widgets, etc.) that don't quite make it stand up in comparison if you're serious about desktop use (which we are), so I think it best not to overpromise.
We're making quite an investment into the technology anyhow, though; it'll get there with time (and effort).