Who are the Protoss?
The Protoss are supposed to be a highly advanced race with psychic powers. Protoss units are stronger, but take longer to build. Psionic powers are rumored to include teleportation, cloaking, fake (illusion) units, and the ability to combine multiple units into a stronger one. (Kind of like Voltron, I guess.) These powers may change in the final version, however. Since Protoss are so powerful, you may be limited to grouping fewer units, the opposite of the Zerg. If standard (Terrans, I guess) is 12, and Zerg is more than that, Protoss would be less than 12. Interesting approach…