The 12b model is the first 12-incher to join the Chromebook x360 lineup form HP. It integrates a 3:2 1366 x 912 touchscreen and it weighs around 3 pounds, while the new 14-incher gets 768p or 1080p 16:9 displays and weighs ~3.5 pounds. Both may be equipped with up to a Pentium Gold dual-core CPU, up to 8 GB RAM and up to 128 GB of eMMC storage.
https://www.notebookcheck.net/HP-Chromebook-X360-12b-and-14b-convertibles-launching-soon.435606.0.html