Hi,
I didn't notice that anyone else has reported this (sorry if it's old news)...
I've just discovered that newer core-sets come with an updated version of the rules booklet. However, the original version is the only one that's provided as a PDF download.
I only noticed when I took a rule book from an older set and one from a newer set, and leafed through the pages of both together.
It's very odd that FFG haven't replaced the PDF download with the latest version that they are including in the newer core-sets.
FYI: This newer rulebook includes Phase 0 and other timing changes, and also includes the rule that a unit has to be assigned enough damage to destroy it (not just damage equal to it's hitp-oints, as in the original rules).
Toastcrumbs