I dont think that we will get any new major content patch for sod, for 2 reasons:
- Blizzard still haven’t said anything about it. It is logical, that if we really have new phase in future, blizzard say it for more hype, but if it’s last phase, it’s not good for them to say it directly because many players will leave, so in this case it’s logical for them to just keep silience.
- We don’t have any leaks of what new content can be. All previous content, such as kara crypts or scarlet enclave, was leaked long time before its release, now we dont have any leaks of what this new conetent can be (except of dwarf shaman/ undead pala NPCs but it’s not really new content). Of course it can be a surprise but i dont think so because all previous content was leaked loong time before release.
I think maybe they will release undead palas/dwarf shamans as it’s very easy for them (no need to design something new, just new class-race combo is pretty simple to release), and maybe it will prolong life of sod a bit, but i dont think there will be new major content patch.
About TBC, i remember that they have said directly multiple times that there will be no SoD TBC and it’s absoilutly not their direction for SoD.