According to
this link, Saturn won't be getting a minivan until 2006 (likely released in '05, then). Frankly, I'm amazed that GM continues to assume the division will take care of itself.
Minivan sales as a whole may be down but, according to the same site, the segment accounted for 1,134,801 buyers in 2002.
I suppose that the GM way means Saturn will need to wait until Chevy and Pontiac receive the new version of the Venture and Montana respectively - but, considering the success of the Opel/ Vauxhall Zafira in Europe and considering that Saturn was able to procure an Opel platform for use in the L-series, would it not have been a good idea to have brought the Zafira in by now?