The CSS file, if you don't want to read through it yourself, indicates the addition of Warlords of Draenor in the same pattern as the ones we've come to expect for Mists, Cata and so on. There's also the Digital Deluxe edition upgrade, but there isn't a pre-order date stated in the CSS, and nor has Blizzard announced one.
While it certainly shouldn't be taken as any assertion that a new Scroll of Resurrection is coming, there is new imaging for it and it's mentioned in the same updated CSS. Why don't we think a new one is coming? Well it's certainly not impossible, but it would seem rather odd for Blizzard to allow long-abandoned accounts to receive a level 80 just for rejoining when they want us to shell out some cash for the Warlords of Draenor expansion and a "free" level 90 boost. Not to mention the likely addition of purchasable level 90 boosts coming soon, as the feature is tested on the PTR.