Rotation for the week:
Raynor
Muradin
Uther
Azmodan
Jaina
Diablo
Zagara (Slot unlocked at Player Level 5)
Thrall (Slot unlocked at Player Level 7)
Lunara (Slot unlocked at Player Level 12)
Brightwing (Slot unlocked at Player Level 15)
Normally, I wouldn't bring it up, but I think it's interesting that Blizz avoided any of the heroes who got large reworks this patch. They clearly know people are going to be excited to play the reworked heroes, especially Illidan, already, and don't need even more people queuing up to play them.
Also of note, this will be the first hero rotation where players can use the free rotation heroes without owning them in HL/TL as long as they've gotten them to lvl 5, so you may see a slight uptick in these heroes in those modes.
Finally, I still think Diablo will work great alongside Dehaka, so it's nice to see him on rotation this week.