Information is still confused, apparently. Maybe they've been put on notice that the summons is imminent.
The Cardinal of D.C. was supposed to leave today for Rome to attend a meeting but that was cancelled and he said his plans now are to leave on Sunday for Rome.
This is from the BBC website:
Cardinals - who will elect a new pope after John Paul dies - are arriving in Rome from all over the world, the Italian media have reported.
Link
http://news.bbc.co.uk/1/hi/world/europe/4402323.stm