Haaretz newspaper of Israel looks to the future
Look for Hamas to make a play for government. Arafat has held iron control for a long time and there are many factions which will all want a piece of the pie. This can't be a huge surprise ( have you seen a picture of Arafat recently? He looks mostly dead already!)
and there has been a lot of maneuvering in the past two or three years. Still, if he dies tomorrow there probably won't be enough time to rally around a successor. Expect it to be messy- even messier than usual.
I expect there to be at least one major bombing in the next few days as Hamas makes a play for influence.