No, Java 7 has not been released yet. At JavaOne just a few weeks ago, it was announced that there will be a number of milestone pre-releases of it this year and a release candidate in February 2010. The final version of Sun Java 7 will not be released before March 2010. After that, it will most likely take months or even a year before SCJP 7 will be out.
So at the moment there is no reason at all to wait for SCJP 7.