Giant Bomb has never been in the business of reporting on every single news story (at least not formally - most items of any significance at all will at least be touched on in the Bombcast and/or Bombin' the AM).
I don't think there was really enough meat on the bone with this Halo 5 news to prompt anything. It's just a title and a vague release date that's over a year away for a game that's a known quantity that has already been teased at last year's E3. I'm pretty confident there will be plenty more Halo news to report on in a few weeks at this year's E3.
GB doesn't really bother with product announcements, especially if there isn't video available. The practice of turning a press release into a two paragraph piece of "news" is very boring. If everything you need to know can fit in a headline then it's not worth writing an article about it.
Thx for the input. Halo must be losing its mojo. I remember a time when everybody freaked out when they saw the letter "H" . But you´re right, there´s no real news besides the obvious fact that something is in production atm.