I think it's too early to know for sure, unless someone stumbles upon more port schedules. I wouldn't be surprised if we saw shorter transatlantic cruises or maybe two different cruises to get from Florida to Europe. They were practically giving away the transatlantic cruises in 2007. I can't imagine they'd think that a 14-night transatlantic makes sense.
The Transatlantic cruises didn't sell well but it also had to do with timing as May most children are still in school and a lot of schools start up again in mid August in a lot of places. Maybe they will do the Transatlantic earlier in August to avoid what happened in 2007?
Or they can do a transatlantic cruise that has quite a few stops along the way like Holland America does
Here are some examples of HAL's itineraries when bring a ship back to the U.S.
Civitavecchia (Rome); Monte Carlo, Monaco; Barcelona, Spain; Cartagena, Spain; Cadiz (Seville) Spain; Funchal, Madeira, Portugal; Fort Lauderdale, Florida
Venice, Italy; Dubrovnik, Croatia; Corfu, Greece; Messina, Sicily; Civitavecchia (Rome); Cartagena, Spain; Cadiz (Seville) Spain; Funchal, Madeira, Portugal; Half Moon Cay, Bahamas; Fort Lauderdale, Florida
Lisbon, Portugal; Portimao, Portugal; Cadiz (Seville) Spain; Casablanca, Morocco; Funchal, Madeira, Portugal; Lanzarote, Canary Islands; Tenerife, Canary Islands; Fort Lauderdale, Florida
Barcelona, Spain; Alicante, Spain; Malaga, Spain; Casablanca, Morocco; Cadiz (Seville) Spain; Lisbon, Portugal; Funchal, Madeira, Portugal; Half Moon Cay, Bahamas; Fort Lauderdale, Florida
Or you have
RCCL who does shorter European cruises on a few dates
4nt cruise Harwich, England; Amsterdam, Holland; Oslo, Norway
4nt cruise Stockholm, Sweden; Visby, Sweden; Oslo, Norway; Copenhagen, Denmark
4nt cruise Oslo, Norway; Copenhagen, Denmark; Tallinn, Estonia; Stockholm, Sweden
4nt cruise Oslo, Norway; Amsterdam, Holland; Oslo, Norway
4nt cruise Stockholm, Sweden; Tallinn, Estonia; St. Petersburg, Russia; Stockholm, Sweden
5nt cruise Copenhagen, Denmark; Bergen, Norway; Geiranger, Norway; Copenhagen, Denmark
There are a lot of options.
DCL could also just announce half of the 2010 year and not announce the summer itineraries as they have done in the past. At this point it is anyone's guess on what they will offer