Here is some more cool rumor news from Natfka. Sounds like in addition to Tau Mercenaries, the Black Legion and White Scars, there are whispers of Biel-Tan and Saim-Hann supplements in the works. I saw elsewhere that the Biel-Tan supplement would be the first to feature a model wave as well. That would be really exciting to me because I saw the lack of aspect warrior updates as a missed opportunity in the initial launch (you know, not taking into account the Iyanden supplement launch strategy). There are a few of them that really need new versions (hey there Hawks and Spiders).
via Stickmonkey on Faeit 212
I'd heard Biel-Tan was being worked on after Iyaden, and Saim-Hann was later. But from what I've heard lately it seems the supplements are pure labors of love, and not necessarily slotting into releases like we've traditionally thought. That they are following a "when it's done" release scheme, and not strict deadlines. Multiple digital supplements in a month would also not be unheard of.
There is a lot going on. I've heard scattered rumors of 2014 seeing many new models introduce to codexes with rules in box, but I haven't confirmed this.