Now that Expats.SE is open-beta, will expat related questions be migrated there or will they stay on Travel.SE?
- Travelling, usually passing a border, with a visa. Such questions are completely on-topic here, no matter what the visa status here (tourist, student, work, permanent resident, national, …).     
- Questions about mixing short-term and long-term visas and activities. Just because a long-term visa is involved doesn't make them off-topic. (Consider the symmetric case: short-term-visa.SE would reject the question as involving a long term visa, long-term-visa.SE would reject the question as involving a short term visa.)     
Only off-topic questions should be migrated. Not questions that happen to be also on-topic elsewhere.