I saw the following item in the most recent PTR patch notes.
Targeting for Powershot and Glaive Toss has been improved. These abilities will now always hit the primary target and are much more responsive about which secondary targets they hit.
So it looks like the fix for these abilities will indeed be part of patch 5.2. The fix should be more noticeable among players who use Powershot in PvP.
Glaive Toss tends to be the purview of PvE, and I don’t know that there have been too many complaints from players regarding it’s functionality in raids. In other words, just know that it’s working, but don’t expect to see a huge increase in DPS or performance as a result.