Java 7 is out ! Hooray !
If you want to know what Java7 can do for you, take a look here: http://www.oracle.com/technetwork/java/javase/jdk7-relnotes-418459.html#changes.
But beware, you should not use it right away. Give the folks at Oracle some time to fix some of the bugs that are still in the code. Some of them make working with Lucene and Solr impossile which then means, that working with Liferay is impossible (you can use either Lucene or Solr). If you want to know more, you can take a look here:
My suggestion would be to stick with your existing Java 1.6 installation and try again in 6 months.
If you like this post it would be very nice, if you could click on some of the google ads you see on the right side. It helps me run this block and motivates me ;)
If you have any questions, feel free to leave a comment.