Based on the past experience, I believe Dell will be among the first manufacturers to incorporate Intel's newest processors.
My current bet is that Dothan's 2.0GHz, 1.8GHz and 1.7GHz will be available around May 9 in newer versions of I8600, D800 and M60. Possible new names (e.g., I8650, D805 or D810, M65 or M70) won't matter as long as no other major changes occur. Recall that the GPU upgrades of D800 and M60 are quite recent. Although Dell must
be working on providing ATI 9700 or better with Dothan, it's occurence with Dothan's release would be just a coincidence (perhaps feasible with Inspirons, but quite unlikely with Latitudes, and definitely not for M-s in view of their OpenGL certification requirements).
For simple upgrades from Banias 1.7GHz to Dothan 2.0GHz, I would expect price increases of about $215 for I8600 and D800, and more for M60 (in view of its pricing scheme). Several sources quote $637 for Dothan 2.0GHz, $423 for 1.8GHz, $294 for 1.7GHz. The current prices of $423, $294, $241 for Banias 1.7GHz, 1.6GHz, 1.5GHz are expected to drop to $294, $241 and $209.
If these predictions were true, the price of a refurb I8600 with Banias could drop by about $130 for 1.7GHz, $53 for 1.6GHz, $32 for 1.5GHz.
So here are some answers to the previous posters:
I don't think you will learn much during the next week (the rumour about new models has come from a single source). It's more likely that you will be able to order a Dothan model after May 9. It's hard to estimate the probability of a new model reaching you before June 1 (right now it takes about two weeks for I8600 in the US, and up to four weeks for a new model wouldn't be unusual). Let's just say that I also need a new laptop before the end of June, and I'm getting nervous because I'll probably have to wait two weeks before ordering it due to administrative reasons.
The prices of refurb I8600-s are unlikely to drop significantly within the next two weeks.
Yes, M60 (or its successor) will definitely get Dothan (being Dell's flagship notebook workstation).
I doubt you will be able to get Dothans via Dell's spare parts soon. Anyway, Dell's spare-parts prices would be much higher than the manufacturer's prices quoted above. Expect other vendors to come into play eventually.