Interesting then, isn't it, that they keep porting Greyhawk ideas to the Realms but don't really touch any Realms ideas in the Realms. Most everything we have so far updates a classic GH module and relocates it to the Realms.
Were the old FR adventures just so bad that they aren't worth tapping for this? Or does this policy implicitly acknowledge that Realms-origin stories are even less interesting than the GH ones?
No, I just don't think there are very many Realms-centric adventures out there to begin with. Most Realms stuff has all been mainly setting material and gazetteer stuff, with most adventures made specifically for the Realms falling in the 'Living Realms' type of thing. On top of that, Realms-cetric modules are all from like the mid '80s on... and all of these repurposed "classic" adventures that are being used for the 5E APs are the really old ones that came out before then back in the '70s and early '80s. I mean, it's not like WotC is repurposing 2E or 3E generic adventures either.
But let's also not forget that all of these classic modules that WotC is repurposing are NOT Greyhawk modules. They are generic modules used for tournaments and stuff and it was only after they released the World of Greyhawk box set that they
assigned places on Oerth where you might find these modules. So people only started thinking they were actual Greyhawk modules after the fact. And even further... none of the APs released
prior to this one with Acererak had anything in them that was actually from any other setting. Yes, the ideas for these APs were inspired by previous modules that people attribute to Greyhawk... but nothing within any of the adventures actually were Greyhawk related. So WotC never "stole" anything from that setting and gave it to the Realms to begin with.
I mean, if anyone can name an actual classic Forgotten Realms module and what that module's central story is about... maybe that could eventually become the story basis for another AP down the line. But god knows I can't think of any "classic Forgotten Realms module" for the life of me. I'd say
maybe 'Under Illefarn'... but they already did repurpose that one for their D&D Next 'Scourge of the Sword Coast' adventure. Which means all we really have are our other "classics" to repurpose, all of which are our '70s and early '80s famous ones... all of which get thought of as Greyhawkian despite them not originally being that.
And besides... everyone who wants other campaign settings are going to get their wish next Autumn 2018. The last great "classic" module remaining for WotC to steal from is "Expedition to the Barrier Peaks"... so the plot line of the next big AP is going to be Faerunian adventurers finding a space ship in like the Graypeak Mountains, and once they explore it and get the ship running... this 'Spelljammer' ship will take them to Sigil and then out to a bunch of the other campaign worlds, like Oerth, Khorvaire, Athas, and Krynn.