It's likely not long to wait either way for part of it; Virtual Datacentre Travel (same region) is planned for 6.18 according to the live letter.

6.1 (Ishgard Housing) is stated as April and 6.2 (Island Sanctuary) is now more likely August - on their new 4 month schedule, so June or July one would think.

One comment though,for full DC Travel - we've seen some issues on Materia (that are starting to settle now, thank the 12) when people from different regions play together, there are some differences in the way things are approached - Prae and macro use being just 2 of them - but it goes deeper than those and it does cause friction.

It's getting smoother for us now, which is nice, but it was pretty rocky at the start.