In their new strategy staatement, eZ systems states why they develop the software they do, how it all relates to the eZ publish CMS, and a mention of their plans to built on top of the eZ platfom.
They look at the "mature market" that is the realm of PHP, noting it's a perfect time for them to make this move. They also talk about their development being done in "the PHP way", popular in the community. Their new focus is one driven by the community, too, adapting itself to the current climate of the market. They're also seeking to raise up the standard of their development, at the same time, raising the bar for other PHP platforms out there.