Not sure who is spouting this and where it is “based” on , but the next expansion will be old god /void VS titan based .
Someone saw galkrond and now it is scourge lol .
1: We are reviving Try , who battled old god / void forces
2: All patch 2 campaign is about “whispers” driving the Neltharion mad
3: In Sarkareth boss room , he freaking opens a void portal and starts blasting the raid with void powers .
4: In the Bronze dragon campaign (AKA your Galakrond reference) , Iridkron drains Galakrond essence and vanishes in a VOID portal .
5: After the above Nozdormu confirms that Iridkron is outside of his range of vision . AKA not on Azeroth .
6: In the latest dreamsurge patch they straight out say that Iridikron is no longer on Azeroth .
Crux of the matter is , that Iridikron stole Galakrond’s essence . Galakrond’s essence was from Tainted water . The same water now flowing trough channels in Valdraken and Ruby Life shrine .
Tyr says that dragons are good at "adapting " to any form of magic and was experimenting on them .
They are basically hinting that Galakrond was created by old gods / void trough the same means.
Lastly not to mention the speculated 6th Old god , who is present on the side of cover chronicles and is hinted here and there .
Next expansion will be about old gods at the start and move on to Void at the end , with a mix of titan here and there . I wouldn’t be surprised by another space travel expansion .
If they are ambitious though they may do a full reset , but that is unlikely .