Right now everything's a bit different from the usual with the economy the way it is. Automakers typically wait to see how the new vehicle is received by the public. From what I've seen, the response to the Traverse has been relatively "good" for a brand new vehicle. But it seems there is some inventory out there.
With GM shutting down its production for January, it's hard to say when inventories will be depleted. GMAC also just received an influx of cash to help make loans easier for GM. But to answer your question of when GM starts to offer lower APR's, from what I've seen working in a GM store, it's usually about 6 months into the release. I don't know what the APR's are for the sister Lambdas, and I'm not sure if you have your heart set on the Chevy, but I would suggest looking at the Saturn Outlook, GMC Acadia and the Buick Enclave as alternatives.
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