IBM has an interesting article up: Zend Core for IBM technical roadmap. I have high hopes for this relationship.
The article talks about web services support, XML support, and database support while briefly mentioning security. I think its safe to say that these are the things that enterprise users are interested in.
While the object support is what interests me most about php 5, I think that support is simply assumed by enterprise customers. In other words, adding this support isn’t a feature, its a bug fix.
The article also discusses PHP 4 versus PHP 5, offering the assessment:
The majority of production PHP servers today still run PHP 4, and that balance is not expected to shift to PHP 5 until sometime in 2006.