The ePub ebook standard has always been built on top of HTML. As has MOBI. But now, Amazon is taking it one step further with their Kindle Format 8 standard, supporting HTML5-based formatting options. Future Kindle Fire owners, be happy.
As TechCrunch points out, this means that devices utilising KF8 will have a wider range of image, font, and resolution options to choose from, making each ebook file more flexible. And on platforms the Kindle Fire, iOS, Android and PCs this means ebooks won't look like they were spewed forth from the Web 1.0 gods. And obviously improved image handling means comic books have a home under Amazon's roof.