If you're eager to get your hands on this new set of tools, you'll be glad to know you won't have to wait. Microsoft has posted a Customer Preview of Office 2013 here. You'll need to be running Windows 7 or the Release Preview of Windows 8 in order to install it. You will notice the Customer Preview runs a preview of Office 365 Home Premium Preview. In the end, you're still able to use the newly announced features, but have to go through Office 365 to do so.
Dive in and let us know what you think about it. Or, if you're still on the fence about trying it, you can readand then decide.