I would hope they start their design for Civ VI (2015), but in the mean time a Winter (December), Spring (April), and Summer (August) DLC with 2 Civs and a scenario before a March 2015 release of Civ VI.
At this point, when after the release of BNW, we have 43 playable civilizations I think single Civ DLC releases might not be profitable / wise in business sense. Hence I am hoping they would release 3 4 DLC packs with Double or even Triple Civs accompanied with appropriate scenarios and possibly some new natural/world/national wonders and/or new great works.
I highly doubt there will be a third expansion pack, but these double/triple packs would surely sell nicely even with a bit higher price, say 10-15 eur each.
I think first pack could come as early as August, second October and final third in December. Then they could release CiV Ultimate version in Q1/Q2 2014
Hmm I like to dream a bit, IF there won't be a Native American Civ in BNW then the first DLC triple pack could be something like Sioux, Pueblo and Inuit. The second Ancient Empires with Sumeria, Phoenicia and Hittites and third Fan Favorites with Kongo, Israel and Vietnam.
How do you see these possible DLC pack releases after BNW?