Back a bit ago WotC announced they were cutting some books and the minis line and other things and the cry went out far and wide that they were doomed. To be fair if WotC had changed the name of a book or the cover art there would be people out there on teh internets claiming it was a sign of their near death.
One of the books that met the gallows that day was "Class Compendium: Heroes of Sword and Spell". It's purpose was to update some of the earlier PHB classes to the new Essentials format. It was never high on my list as something to get; PHB classes and Essentials classes are still equal. But it would have been nice to see some of the content.
So Wizards has released the Marshal, which is the Essentials version of the Warlord.
And they have done it for free. In Dragon Magazine 397.
You can download the Marshal from Wizard's site here, http://www.wizards.com/DnD/Article.aspx?x=dnd/dra/201103warlord
I checked from other browsers to make sure my DDI password was not cached in. It is free.
So if you have not looked into the Essentials classes yet here is a good example.