5 Levels to Go... Heavensward

[Frizze]

The main scenario quest actually gets to a point where it won't let you pick up the next one with the in-game reason being that you haven't registered Heavensward. So, yes, there's a prompt, but yes, it's best to register it ASAP anyway.

Im not sure about this. I know that you get to a point where you cant take the next quest, but if you got to that point without registering the expansion does the next quest show as existing and locked or just not show it? Ive got a friend that has the expansion, but hasnt made it through all the quests yet. He really likes crafting, so LTW was actually his first level 50 class. He finished the ARR quests for LTW and got his Pinga, but afterwords the guildmaster wasnt offering him the start of the HW crafting line yet. And i dont mean the quest was there and he couldnt take it, i mean it wasnt showing any quest at all. So it seems possible to me that it might just not show the quest unless you had the expansion.

[Niwashi]

I know that you get to a point where you cant take the next quest, but if you got to that point without registering the expansion does the next quest show as existing and locked or just not show it?

Either way could be considered an indicator that it's time to get/register the expansion. If the next quest is there but red/unavailable with the given reason being that it requires the HW expansion, then that's of course a much more obvious indicator. But if it simply doesn't show up at all, then you know it's time for the expansion when you reach a point where you complete a MSQ and there isn't anther one there to follow it. Up until then it's a continuous chain with another quest always available whenever you finish the one before it.