I too really enjoyed honour amoung thieves and I hope they do more forgotten realms movies.
They did do a tie in with honour amoung thieves, Keys from the Golden Vault - an anthology of heist adventures including one at Revel's end. But they don't seem to be doing a tie in adventure book for bg3, not unless 'Phandelver and Below' or 'Turn of Fortunes Wheel' (planscape) has some connection we're not aware of yet. They may feel the existing Descent into Avernus adventure is enough.
As for the d&d beyond - they're currently working on integrating that with their upcoming 3d virtual table top/video game hybrid thing. So they're probably not going to divert resources from that to add a bg3 character importer.
