Ironically, given that there is a real volcano right next to Symi, on Nissyros, it is the Icelandic eruption that is causing all kinds of problems to tourists trying to get to Symi or back home again, as well as to home owners trying to get to their properties, seasonal residents arriving, and permament residents with family business elsewhere.
I've been writing a travel blog for Symi Visitor Accommodation which can be found at
http://symivisitor-accommodation.com/blog/
and during the emergency situation I'll be updating it every few hours with whatever accurate information I can glean from many sources.