The split worldview only last a short time
http://www.nintendoworldreport.com/news/40862/dragon-quest-xi-dual-mode-play-explained
Some clarification has been obtained about the "two worlds" view of Dragon Quest XI where the game can be played in 16-bit style 2D or in 3D.
According to a leaked Jump magazine in Japan, the dual view will run for the early part of the game, then the option will be given to switch between the 2D and 3D modes on the fly. The dual view was shown in the game's original launch demo last week.
The 3D view is similar to Dragon Quest IX's in having visible enemies, while the 2D view will feature the series's trademark random encounters.
