Which countries are coming in schengen?

As of January, 2009: The full Schengen members are Austria, Belgium, the Czech Republic, Denmark, Estonia,Finland, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden (but not Ireland and the United Kingdom) plus Iceland and Norway (which are not EU members). Cyprus which joined the EU in 2004 and Bulgaria and Romania which joined in 2007 do not yet fully participate in Schengen. You will therefore need a valid passport or ID card to travel to those countries and to Ireland and the United Kingdom. Switzerland is the newest member of the Schengen area. Switzerland has been cooperating with the Schengen zone and started implementing rules on December 12, 2008.
The full list of the 26 current (as of 2012) members of the Schengen area is:

Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden and Switzerland.

Bulgaria and Romania are due to join Schengen in 2013.