ETA: March 24, 2011 More details on the book, thanks to hilary!
For translations on details, go to Tombow's post here.
ETA: Jan. 30, 2011, adding new info, (Product info from animate online shop, as reported by Kirara's post below ^^) It will come out on April 22, 2011, and it will be 1,699 Japanese yen (plus shipping) Full-color, 146 pages, A4 size With over 100 pieces of Arakawa's original illustration artworks for the series, including works done exclusively for this illustration collection, and pieces never been included in tankoubon/magazine publishings before, plus some comments by Arakawa, including some tidbits of stories from the FMA production that were never told to the public before...
Found this scan on Baidu, which has a one-line advertisement about the artbook 3!!
On the Right side page of the posted scan, at the bottom, it simply says:
Hiromu Arakawa Illustration Collection: Fullmetal Alchemist 3 ...Coming in March 2011!!
No other info on this illustration collection book yet.
(For info and discussion on the upcoming new FMA guidebook, "FMA Chronicle", please go to "FMA Chronicle" thread. )
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Thank you so much, hiraly!! And, thank you for the cover pic also!
Images as posted by hiraly above:
here it says: Hiromu Arakawa Illustration Collection 3 will come out in Japan on Friday, April 22, 2011, and the size is A4, 144 pages, and it will be 1700 Yen (tax included) On the right side, it says the book contains over 100 pieces of Arakawa-sensei's illustrations, all in full color!! The ones shown in mono-color in volume books would be shown in color also, and the book contains drawings that haven't been published before!
On the left side, at the top, it says that every illustration is accompanied by Arakawa-sensei's comment, and she reveals some behind-the-scene production secret, her thoughts on the scene, etc.
Below that they show three examples of drawings from the book with Arakawa-sensei's comments:
From the top, example 1: Arakawa cow says (paraphrasing) "When drawing stuff like this I feel my body is getting old. While ago I did check-up, and I was told that my internal organs are about the age of 42, but my mental age is about 14... what was up with that." (Note: I can't clearly read kanji here, so this is my best-guess translation... don't bet your lunch on it, please. ^^)
Second (middle) illustration: Arakawa-cow says "By around this time, while I was drawing this I was thinking (WARNING! Series Final Spoiler ahead! --->)'wait just a while Al, I'm going to get your body back soon!'"
Third illustration example with Arakawa-sensei's comment: Kanji are too blurred and not legible here, but it says something like "Even after the fight against the Colonel, I drew Envy ....something something... but ... something something that bothers Arakawa-sensei and ... needed many re-writing/drawing." I can see Arakawa-cow is "struggling" at the desk. XD (If anyone can post clearer pic of this then I can translate it. ^^)
Below the sample drawings, it says that Animate is taking pre-order now, and if your pre-order on Animate it comes with the Animate limited edition case for this book, with special illustration done by Arakawa-sensei just for this case.