Is there anything official from Immigration Canada regarding this?
I can only find information about cancelled ceremonies and tests, no information on processing though.
Yes. Without detail. Under heading "Processing your citizenship application" it states:
"There will be delays to the processing time."
In the near term this is undoubtedly an understatement. Long term forecasts range from unreliable speculation to wild guessing.
In any event, IRCC has numerous webpages providing its information about, quite literally, "How the coronavirus disease (COVID-19) is affecting immigration, citizenship and passport services. See
https://www.canada.ca/en/immigration-refugees-citizenship/services/coronavirus-covid19.html
For citizenship in particular, see:
https://www.canada.ca/en/immigration-refugees-citizenship/services/coronavirus-covid19/citizenship.html
Those pages may not be the first source to publicize changes but they will likely reflect significant changes, when there are changes, fairly soon after they happen or are otherwise implemented .
Yes, in many respects the IRCC information tends to be vague. (Does not get much more vague than "There will be
delays to the processing time.") But reports from anyone claiming to have more detailed information, or broadcasting changes prior to the IRCC information publicizing changes, should be approached with a big dose of skepticism, at the very least . . . again, any actual changes will be timely reflected in the IRCC online information.
That said, for those who like to watch plants grow and water evaporate, watching the spreadsheets for reports of actual progress will offer some glimpse of whatever activity there is, if and when there is some activity.