I suspect it's just low on the list of priorities - if nothing has changed since when I last had a chance to talk one-on-one with someone from Prometric (at JavaOne in 2005), then SCEA makes up about 1% of all
Java certification exams sat for, overall. There are more pressing matters, therefore, such as keeping the technology-specific exams up to date with the versions coming out every eighteen months.
Now, it would be nice, obviously, if SCEA were updated for Java EE 5, but we'll see when/if that happens. There was, recently, a request for some experts for their preliminary considerations of at least a portion of the exam to be updated...