They're going to answer dippers name and what happened in the portal in the journal that's coming out this July. As for fords sweater, they answered that in the finale. He was hiding the photograph of him and Stanley, in short he was hiding a big heart and love for his brother. We can only imagine what happened to blendin though
Gravity Falls: Journal 3 is the official real-life canon Journal 3, containing information from the show, and Dipper's notes. The book is set to release on July 26, 2016. Journal 3 brims with every page ever seen on the show plus all-new pages with monsters and secrets, notes from Dipper and Mabel, and the Author's full story. Gravity Falls fans will simply love this 288-page full-color jacketed hardcover version of Journal 3! Plus, the book jacket doubles as an exclusive poster!