It appears the Glamour of Tzeentch and Aura of Decay were the primary changes in the Daemons codex. It is nice that they update the old codexs, especially at the time they are releasing a new battleforce for them.
As far as the power scrolls go, it appears to be the only update.
Reference Section – Arcane Items, Power Scroll
Change to “POWER SCROLL 35 points One use only. A Power Scroll can be used when the Wizard makes a casting attempt. During that casting attempt, the casting value of the spell is halved. You cannot choose to boost a spell when using the Power Scroll.”
Chaos_Daemons_FAQ_Version_1_1.pdf
Warhammer_Rulebook__V1_5.pdf
