With BlizzCon next week and Patch 10.2 being only 11 days away, it doesn't seem Blizzard has plans to stop their PTR cadence as they've just updated one of their PTRs to Patch 10.2.5.
This follows previous PTR updates that usually show up on encrypted branches a week or so before the previous patch is released.
This likely means we will hear more about 10.2.5 during BlizzCon next week.
This is also the first patch not present in Blizzard's roadmap, so we don't know what to expect!