Heres a thought...
1. Toa weapons: Red, Blue, Green, White, Black, Brown.
Toa armour: none.
2. Toa wepons: Silver.
Toa armour: Silver.
3. Toa wepons: GOLD?
Toa armour: GOLD?
Does this mean Ev.3? that would be cool!
It may be too early for speculation now (most of us dont even have Exo-suits yet) but it might be possible...?