I don't know. If I could, I would buy a D300 tomorrow. I'm even considering a switch to Olympus; they have some truly sweet lenses (the 7-14, 12-60, 50-200 all make me drool, and weather-proof). And the E-3 looks like a winner to me. Trouble is I'd like some serious kit for my 'big' trip, not after.
In about 10 days I'll be in Hong Kong for a week, probably buying some camera gear. We shall see. Likely, I'll buy a lens or three and wait until the D300 is actually available (Feb.?). After that I'll be in Thailand for a month, Ankor Wat for a week, and then Laos for 3 weeks of jungle hiking, getting stoned, etc. I'll surely need some weather resistance....