Perl 6:	I'm not sure a lot of time will be needed, since core parts of Perl6 is based on Perl5. It's the new additions to the language that is going to take some time to really delve into. I'll start focusing in on it more when RHEL adopts/supports it.
IPv6:	The differences over IPv4 are minute, however if you are a network administrator, you should study up. Otherwise, it's a good read, but unnecessary.
HTML5:	You only have to learn what's been deprecated. The new stuff should be learned, but generally isn't necessary unless you're doing something media-based.
Power Shell:	This is a good thing to look at if you're a system administrator using Windows. Windows 7 has some nice new tools to easily roll out patches to many networked devices.
Old & Outdated:	Tell me about it. For some reason programming Objective-C for the iOS seemed a little more complicated then I remember C/C++ being in the past.

In general, you should read up on the overviews now - just read the benefits from them and see how they might affect your current jobs and near-future projects. If they do, read further. Otherwise, throw them into your "pleasure read" bin - at least, that's what I do.

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Demize