Really, no way of knowing when DCL will release itineraries with this situation.
Historically, generally it's around 18 months out, and over the last few years DCL seems to have adopted this pattern for release dates on new cruises:
"Winter": first cruise in the new year up to April/May (not including spring Panama Canal and Transatlantic) – sometime between late September to early November
"Summer": cruises from about May to August/September (not including fall Panama Canal and Transatlantic) – mid February to early April.
"Fall": September until the end of the year (ending with the last cruise starting in the old year) – generally around May.
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