Will the via dell'Amore walking path between Riomaggiore and Manarola (Conque Terre) be open by September 2015?
If an Italian construction project did publish an end date, I would not trust it. Check the latest in September with local web sites or there in person.
Laurette,
Only the first section of Via dell'Amore is now open (the first 300 meter stretch on the Manarola side of the path)
Here is the Citta' Della Spezia's newspaper article announcing the official opening of the first stretch of Via dell'Amore (scheduled for April 3, 2015): http://www.cittadellaspezia.com/Cinque-Terre-Val-di-Vara/Attualita/Via-dell-Amore-venerdi-sara-inaugurato-179529.aspx
You may see photos here:http://www.cittadellaspezia.com/fotogallery/Presentazione-battesimo-primo-tratto-1458_1.aspx
You may also want to read this article;http://www.tripadvisor.com/ShowTopic-g187817-i997-k7835922-PARTIAL_estimated_reopening_of_Via_Dell_Amore_in_March_2015-Cinque_Terre_Italian_Riviera_Lig.html
It's encouraging to see that part of the Via dell' Amore is now open and hopefully the remainder will be open again soon. It's taken them awhile to get to this stage (it's been 2.5 years since the slides), and the point that Laura alluded to is that Italian construction projects sometimes don't move along too quickly.
At least it should be possible to visit the small bar and have a "cool one" while enjoying the incredible views.