Some comments purloined from the WotC board...
The swordsage is pretty much the monk of the martial adepts with wisdom based abilities and medium BAB. It also gets the most manuevers and stances of any of the three classes.
The crusader is the paladin of the martial adepts. It is a great tank, as it can turn taken damage into bonuses to attack and damage. Full BAB. Crusader can't be True Neutral
The warblade is kind of like a fighter and barbarian. It gets a few feats as it levels. Strangely enough, it has a bunch of abilities that run off of intelligence. I fully expect to see swashbuckler/warblade builds on the CO boards. It has a barbarians proficiencies , full BAB, hit die, and uncanny dodge. It gets bonus feats fairly often...
While they all use manuevers, they all have access to different sets, with each class having at least one set unique to it. The Sublime Way styles look like they will shape what the classes are capable of, but I have not finished reading them yet, so I can't say for sure.
Yeah, it does have a wuxia feel to it. If thats not your thing, then this book probably isnt for you. I love that stuff, which is why I think the book is awesome. *Shrugs* To each his own.
Regarding similarities to Iron Heroes...
Well, I could see some similarities, but the blade magic tends to have more magical effects, it isn't as linear, and, of course, there aren't any tokens involved.
The three monsters included...
Naityan Rakshasa - Shapeshifter. Different forms benefit from different manuevers and stances.
Reth Dekala - LE fire based outsiders. Has a number of manuevers and fire/acid vilefire abilities
Valkyrie - Battle seeking outsider. Looks for tough people to fight and engages them. Wasn't impressed.