Just saw this about the new survey module and downloaded the current development version from github and installed it on my Moodle 2.6 dev site after removing the default survey module.
As teacher it works great so far, as I am able to develop and answer survey questions. However, as a student I am unable to see the questions, only the Pause and Submit buttons when I click on the Attempt tab. If the student clicks the Pause button, the teacher and student will see an in progress attempt. If the student clicks the Submit button, the teacher and student will see a closed attempt. But there is noting to see in the attempts.
Changing to the different Advanced Permissions did not make any difference.
I noticed the in the access.php file that none of the capabilities contain any student entries. Maybe that is why students cannot answer questions.
I am using Moodle 2.6dev (Build: 20130514).
Keep up the good work on the development,