As good as confirmed that Brexit day wont be the 29th March (the EU very unlikely to block a short technical extension if a deal has passed but a couple of weeks needed for legislation.)
So the news specials planned for that day are going to be have to be scrapped.
Not necessarily. Any extension request has to be approved by the EU and they've made it clear that the UK needs to provide a good reason why.
So it could be that parliament voted not to leave without a deal and votes for an extension... and none of those two things happen. In that case we'd crash out on 29th March.
The only other option is that the UK withdraws Article 50, which it can do but I suspect might need parliamentary approval and laws to be passed/annulled
I don't think any newsroom will be cancelling any arrangements, it's all still up in the air