PA's crit chance going from 1-in-5 to 1-in-6 is a slightly bigger change than the mere "3%" makes it look like.
Looks like its mostly just very minor tweaks, with the exception of PA. Don't see anything that'd really shake up the current meta.
Yeah I think it's exactly what you want right before TI, don't invalidate team's prep completely but still nerf in-meta and buff out-of-meta heroes to potentially buff creativity and make more things possible, encouraging teams to experiment a bit, thus making matches more interesting.
Honestly it's not even that much. Pro players will feel it but pubs will likely be completely fine with this. Fights in pubs are messy and drawn out enough that the procs will still come.