I suspect strongly it was announced to stop all the speculation and chatter.
On seeing that coat at the wedding “is she pregnant” was my first thought - a completely normal, passing wonder on a high profile public figure who’s my age and has just got married into one of the worlds most traditional insitiutions.
Being happy for them is no crime and previous speculation is to be expected to some degree.
It’s nice news, good news, and brings a degree of light relief from the standard upsetting and unsettling news of the world at present.