It's commentary on the g1 garbage collector. The Sun page says "A preliminary version of the new Garbage First (G1) garbage collector is also included. Although G1 is available for use in this release, note that production use of G1 is only permitted where a Java support contract has been purchased. " The Slashdot post is mainly speculation about whether Oracle will put new stuff in Java for business. The comments note it is an experimental feature and Sun/Oracle is recommending you not use it in production without support from them.
Personally I'm not worried. IBM has their own JVM already. And there is the open source one too. It's not like Oracle/Sun is the only player in the game. And they know this making it not in their interests to diverge actual Java.
I've been expecting that Sun would put G1 into its next JDK 6 update. Having played around with it some I can see why they essentially have said "don't bother to tell us about the problems you are having with G1 unless you have paid us some money" because the version G1 that I have been testing (in JDK 7_b35) is extremely fragile - I cannot get an app server to run with G1 under load for more than an hour before the JVM crashes. I'll have to give the G1 in JDK 6u14 a go to see if it is better than what is in JDK 7.
Wow, JVM 6u14 ran all of 15 minutes with G1 when under load. Looks like it was attempting to do the second minor collection after the first major collection when it rolled over and died. With JVM 7, using the same test, it ran at least a dozen major collection before dying (with G1 the first major collection is held off for a long as possible).