It is way past time to update what we know about the 40k timeline of releases. So I am updated the pages above, as some of them are more than a couple months old. This is a compilation of rumors regarding the release order.
Until recently our release order looked like the following...
via Hastings (release order)
Dark Angels
Chaos Daemons/Daemons of Chaos
Tau
High Elves
Eldar
Lizard Men
Updated Release Order Rumors
via Stickmonkey from the Faeit 212 inbox
4/1/13
May: High Elves
June: Eldar
July: Apocalypse
August: Lizardmen
September: Blood Bowl
October: Space Marines
November: Dwarves?
December: Hobbit
January: Tyranids
I had Dwarves a lot sooner than others, so its probably safe to leave a question mark. It could possibly be brettonians or wood elves. Im basing my prediction of Dwarves on where I recall them being design wise, which was right after lizardmen.
I've had multiple confirmations of space marines being the last 40k codex of 2013 and Tyranids being the first codex of 2014.
October is a Black Box release, blood bowl and Warhammer quest have come up, although...it could be something surprisingly different...
When Hastings weighs in, I'd go with his schedule always.
via an Anonymous Source from the Faeit 212 inbox
3/23/13
Just Sayin,
1. Tau
2. Eldar
3. Space Marines
4. Nids/Ork tossup.
5. IG
6. The Nids or Orks that get pushed back.
via Hastings Release order discussion from warseer
3/22/13
MajorWesJanson
Tau are next, then Eldar. Sisters, Templars, Orks, and probably Nids need books before IG does.
75hastings69 response
Not quite, remove sisters & Templars...... replace with SM & IG....... Although the order of them might be mixed up a bit
Oops my mistake, I thought you were listing the order, then I realised you were listing codex that need updating before IG ....... still a little further look ahead in the future of 40k never did any harm did it?
another posted question
I was under the impression it was Tau, Eldar, Orks, SM, Nids, then Guard?
75hastings69 answer.
Move the orks
via Anonymous Source
3/31/13
just been informed we should be looking at WHFB high elves next month, followed by Eldar the month after and Apoc the month after that.
via another anonymous source
3/31/13
Games Workshop is aiming for an army book/codex every month. Its high elves, eldar, apocalypse, lizard men, marines then tyranids. I'm just not sure of the months and whether marines are October or November and what was in between marines and tyranids.
This is a separate source than what we had heard from earlier this morning. I had not checked my inbox yet, when the earlier post went live, but it seems to confirm that we are indeed going to see eldar very very soon.
Attaching this rumor set to months would look like this.
High Elves- May
Eldar- June
Apocalypse- July
Lizard Men- August