Good news over at Joomla.org - extensions with hidden advertising will be clearly labelled.

We've covered this topic two times on this blog and thoroughly support the decision. I think this will do quite a bit to protect the reputation of Joomla and 3rd party developers. Its embarrassing to explain to high-value clients why their Joomla sites contain hidden links to hotels,  apartments or random web developers.

This is the notice that will appear on guilty extensions: