CAAAD,
There should be periodic updates to keep us in the picture.
But we have had no news from anyone for two months now, which is unusual to say the least.
I disagree.
1. 'Periodic updates' do not give a full and complete picture (by definition) and so allow those who write headlines to publish banners which have little link to reality. Further, as an investigation progresses, things which may (earlier in the investigation) have appeared to be causal, may in fact not be whilst new things pop up; 'periodic updates' might therefore be contradictory or confusing if read in isolation.
The best 'periodic update' would be "we're still working on it and will let you know when we have the full story. Until then, naff off and stop making us waste time we could be spending on the investigation."
2. It is not at all unusual for investigations to stretch into several months (indeed, years). Not having heard anything for "two months now" is not unusual in the slightest.