<<Since they are gone from the official, and under the
Gentleperson's Agreement, all 3rd party publishers who have used material
from the draft that is not in the official, are required to bring their
prior products up to date.
>>
Unless the agreement was documented explicitly to the contrary, however, then it may be inferred that WotC has to give reasonable notice to change products.
In that case, people getting ready to go to the printers next week might be OK for their first draft of a product. But products coming out a couple of months from now might be subject to change, cancellation, etc.
Lee
