Glyph of Curse of Agony

[Eeks]

Can anyone confirm the mechanics of this glyph yet? It claims for 4 seconds longer. Would that be 1 or 2 ticks and also, are the next 1 to 2 ticks in a different tier of damage since CoA damage hits harder as it get deeper into its duration?

[Raptorg]

According to wowhead, CoA ticks every 2 seconds, and therefore you gain 2 more ticks, wether they're at max power, or at even higher power, is something I don't know.