Interesting that you mention C300s in your response, I'm presuming that its not in reference to news production at all? Guessing a C300 would be overkill in all respects at the present time?
I wasn't suggesting C300s for news, just mentioning that they are being quite widely used in Factual (which is not news).
For News the Canon camera range is more likely to be the XF series (which has the same recording system as the C300, but instead of a large format single-chip, uses a conventional triple sensor block with 1/3" or similar sensors)
It's not the right solution for News - wrong body design and to get the best from the pictures you really need to grade. (Which News don't normally do)
Technology moves so fast at times, too fast in my opinion, but it does make me wonder how far away we are from 4K filming for news etc. Obviously its OTT now, but I guess its getting closer all the time, although having said that, 4K production would no doubt mean a major upgrade for the studios and gallery, presumably a move to fibre and a substantial investment (also in cameras and editing) - so possibly not that close thinking about it!
Many non-news studios and almost all OB trucks use SMPTE fibre already for the Camera/CCU connection, and fibre connectivity for other video routing - but glue, routers, mixers and VT
/Servers would all need upgrades to their 1.5G/3G infrastructure.
It's becoming possible to build 4k OB trucks (Telegenic, who do a lot of work for Sky, are building one) - and Sony have a method for using their F-series 4K cameras with a camera adaptor and regular HDC-series CCU to provide fibre connectivity and remote camera control (for racking)
If you move from HD-SDI (aka 1.5G) 1080/50i to 2160/50p you have increased your data rate by 8 times (interlaced to progressive doubles it and the 1080 to 4k resolution change increases it by 4) so it's still quite a major change.