President Trump has announced he is banning all incoming flights to the USA from Europe for next 30 days. The 26 "Schengen countries" will banned (the countries with an open border to another EU country), but currently excludes the UK and Ireland (thank goodness for the English Channel). The ban will include any British people who have been to any of the 26 Schengen EU countries in the last 14 days. This appears to include layovers, although I cannot seem to find confirmation.
However, if the spread is not contained here in the UK, the ban could include us, too.
At this stage, unless your airline stops flights, Disney World remains open and welcoming UK guests.