I was in Sydney on the weekend and I picked them up from Kinokuniya, so I thought I'd write a review.
They're the same thickness as the Dark Horse manga (around 200 pages), but slightly larger. They also have a glossy cover jacket. The price is about the same or slightly cheaper.
The manga is by Akira Himekawa, because of course Osamu Tezuka has passed away. The style is of the 2003 series, and has a noticable "busier" look to it. I found I have to look longer at a picture to figure out what's happening. It's going to take me a little while to get used to this.
The first thing I noticed is they read from back to front, in the Japanese style. Everything is translated though, and where there is large writing of onomotopaeia in Japanese characters there is the translation along side it in small English lettering.
The pages lack any real borders, with the artwork extending to the very edges of the pages. I find this a little annoying, as some frames look as thought they might have been cut off, as though there is a printing size error. Even worse, the artwork extends into the binding, so you have to bend the book wide open to see everything.
The character names have been properly translated for the manga, so none of this "Zoran" rubbish. There's Uran, Atlas, Professor Ochanomizu, Momo, Yuko Kisaragi, etc. The only downside, in my opinion, is Astroboy is called Atom (apart from on the cover). I'm sure Jeffbert and some others will like this though.
The stories look pretty much taken directly from the 2003 series, and are divided into "chapters" rather than separate stories. Some run together from a narrative point of view, others have more of a distinct break. I've only taken the shrink wrap off volume 1 so far. The index is:
Chapter 1: Atom's Birth
Chapter 2: Atom Goes to School
Chapter 3: Saving The Garden
Chapter 4: Atom vs Atlas
Chapter 5: Super Express Robot
Chapter 6: A Cute Sister
Chapter 7: Uran's in Trouble
Chapter 8: Robot Kidnapper
Chapter 9: Invisible Robot
Chapter 10: Skunk's Gang
Chapter 11: Let's Save Lightning!
A quick look shows the content of the stories are more compressed. The story with Magnamite lasts 5 pages, and Magnamite isn't even named or says anything.
Overall, it's hard not to compare it with Tezuka's original work. I haven't read it through so I can't compare the stories yet, but visually I prefer the cleaner (if simpler) style of Tezuka.
Edit: I've updated my Manga page to include this.
I must have these manga! 
Based upon what I saw, I think this is no more than a manga version of the 2003 anime, which is not to put it down, rather, to let buyers know just what they are buying. 
