have received the boards (10 of them) from china this morning (2016/03/21) and I have immediately populated a board - just to see...
I am not equipped with reflow oven at my office, so I have made an attempt with a regular (big 80 Watt) Weller soldering iron :-).
The overall quality of the PCB seems OK.
First board populated
There are only four electronic components on the board: an LED, a resistor, a capacitor and the microcontroller.
The header on the left is to be connected to an LPClink board to flash the device. The 4 pins on the right are for a console.
After the classic continuity tests, I flashed a basic blinky that I had prepared for this purpose.
After a few hesitations, I managed to flash the programm and it worked immediately. So the board is at least "flashable". I have not yet tested all the ports, but I am confident.
Conclusion: it is possible to solder 0.4 mm pitch DFNs with a regular soldering iron (without frying them).