I don't know who are their customers or what they care about. Looking at their sales numbers, they don't have a clue either.
Now, about the D5200:
* 720 GBP is exactly what the 60D is selling for at amazon.co.uk, so expect US price to be around $900
* 1080 video at 50 and 60 fps is interlaced, so please forget about those frame rates; from the spec list, this camera shoots 1080p24, 1080p25, 1080p30, 720p50, 720p60
("interlaced" is not video, it's just a tool for torturing my poor soul)