Unfortunately, our promise to release X5 support hasn’t come true yet. We are working on it, but few more days of delay look likely.
It wasn’t a good idea to bundle some web-to-print performance improvements together with X5 support. Now one part holds the other.
Please, do not try uploading any X5 web-to-print templates or PDF files in place of images until we officially complete the upgrade. The files may be accepted by some servers and not the others causing all sorts of grief later on.