1. IntroductionI spent the 2011-12 academic year on research leave finishing the project (which I started in 1991!) and have mentioned it here, here, here, here, here, and here. The volume translates most of the Hekhalot texts (which are in Hebrew and Aramaic) and I have explained in the introduction why a few have been omitted. Notably, you can already find an excellent eclectic English translation of 3 Enoch by Philip Alexander in Charlesworth's Old Testament Pseudepigrapha.
2. Hekhalot Rabbati: The Greater (Book of the Heavenly) Palaces
3. Sar Torah: The Prince of Torah
4. Hekhalot Zutarti: The Lesser (Book of the Heavenly) Palaces
5. Maʻaseh Merkavah: The Working of the Chariot
6. Merkavah Rabba: The Great (Book of the) Chariot
7. Some Shorter Macroforms
8. Geniza Fragments
Look for Hekhalot Literature in Translation: Major Texts of Merkavah Mysticism later this year. I will keep you posted!