According to the Corriere della Alpi the Zoldo Alto and the Tre Cime stage will be like this:
Oderzo-Zoldo Alto: Oderzo-Cansiglio-Lago Santa Croce-Ponte nelle Alpi-Soverzene-Peraolo-Pieve di Cadore-
Passo Cibiana-Palafavera
Longarone-Tre Cime di Lavaredo: Longarone-Ponte nelle Apli-Belluno-Mas-Agordo-Alleghe-Caprile-Arabba-
Passo Campolongo-Val Badia-
Passo Valparola-Passo Falzarego-
Colle Santa Lucia-Selva di Cadore-
Passo Giau-Cortina-Passo Tre Croci-Misurina-Tre Cime di Lavaredo.
Source:
https://corrierealpi.gelocal.it/reg..._una_due_giorni_leggendaria_in_veneto-9392337
First the bad news, pretty much nothing besides the uphill drag to Lago Santa Croce/Sella di Fadalto before Cibiana.
The good news is that the Tre Cime stage looks like a proper high mountains stage, sadly right before the final MTT. From an Italian Forum:
Valaprola from that side is a proper climb and not like the Valparola/Falzarego from the other sides. 5kms at 8.4% with 3kms at 9% and decent altitude.
That is a proper climb to put before the Giau from the hard side and Valparola-Giau-Tre Croci-Tre Cime is one hell of a hard sequence. If you want you can totally destroy people on this one.