Depends on your current programming role, I think, but SE 7 has a lot of little niceties to it. The biggest win, in my view, in the invokedynamic feature. It doesn't do much for everyday Java users, but it's pretty cool.
I like NIO.2 a whole bunch. try-with-resources is pretty nice too.
Make visible what, without you, might perhaps never have been seen. - Robert Bresson