There was already an article saying that C2 fixed that. They are only shipping fixed products to consumers.
"To resolve this issue, Intel has now issued an official Product Change Notification (PCN) that alters the chipset stepping from C1 to C2, a hardware fix that is expected to affect the delivery dates of a fairly wide range of products."
Edit: Ok I looked anyways. http://www.tomshardware.com/news/Haswell-S3-Sleep-Problem-PCN,21896.html