WPML has always allowed to change the “default language of the site”.
The only difference from WPML 3.1.9.x to 3.2.x version about language is that it is no more allowed to change the “default string language”. Now it is just English
A new feature in the upcoming 3.3 version of WPML is that it is now possible to change the string language for every single string or context.
I will check the documentation and I will try to find at least a good workaround for this problem.