"Isn't it at all questionable how these stories just materialise overnight? One month ago literally nobody was talking about Iran's nuclear capability."
not so - just read this thread - there is a constant commentary on Iran and the bomb.
Or try Wikipedia - they list regular updates by a wide variety of international institutions
Or say the Economist - again regular reports on how much and what grade of weapons material Iran is likely to have.
"It seems to be an unspoken rule of geopolitics that, if you're able to develop and pop off a nuke, you're in the club and nobody will attack you"
i'd say it was common sense myself....................