I don't get what apps you will get in Outlook, if you want to research something it is really easy to just 'Bing it' on Windows 8 and if you want to embed a link to maps you may as well just copy and paste the url. If the person you are sending the email to doesn't have Outlook 2013 you are pretty much stuffed if you start using fancy apps to send them simple stuff.
I also think, that this could be something great if enough people used Office 2013 and if you want to make a clean looking business presentation then the apps will come in really handy. Even for some of the out of the ordinary stuff like embedding a live Olympics medal table or an American Election tracker. There is an app for that.
Check out the Microsoft Office Store here: http://office.microsoft.com/en-us/store/