Not that I can remember.

The Hallows plot develops -- first the discovery of the mark in the book, which lays the foundation for the connection to the story and all that comes of that; then with the reference to Krum's comment, which ties it to Grindewald; and then the discovery of the Peverell grave with the symbol in Godric's Hollow.

Regarding the Fidelius charm question: It is clear that Harry, at any rate, believes that the charm hid the house, not the people alone. This runs counter to Flitwick's comment in book 2 about pressing his nose to the glass without seeing them. And Voldemort's pov is also terribly inconclusive:

And along a new and darker street he moved, and now his destination was in sight at last, the Fidelius Charm broken, though they did not know it yet … They had not drawn the curtains, he saw them quite clearly in their little sitting room…

The talk of seeing a destination just means that he knows where he will find them. It does not necessarily mean that the house has only just become visible, and the reference to windows and being able to see them fits very neatly with Flitwick's comment earlier. And I don't think we get any clear resolution to the question later, either.

How does Bathilda, or the thing that looks like Bathilda, know they are under the cloak? I mean, she could have followed them from the graveyard, and seen the sign spring up as they touched the gate, but … Could it be that Nagini, being a horcrux, sensed the horcruxes in front of her?