With py.test 1.1.1, conftest.py was imported during the collection phase, and stdout was in 'captured' mode. But with 1.3.0, stdout is not captured any more.
This makes a difference in pypy, where importing some package have side-effects (configuration, compilation attempts, etc.) that prints several lines. These lines should be masked, and output captured, like it is in setup_module(), for example.