It's linked from the feature matrix where it mentions typed tables.
Thom
Also, the feature matrix should probably say 9.0b now, instead of 9.0a4.
well I was planning to go over all the 9.0 featurematrix stuff(which is currently a bit rough) a bit later in the beta cycle when the dust settles however I have updated the text to 9.0b1 for now.