I would only suggest uninstalling WiX and reinstalling. For me, when I do
Ctrl + SPACE, I get a list of WiX elements. I clicked just underneath the
Package element in the Product.wxs file and did Ctrl + SPACE.
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http://windows-installer-xml-wix-toolset.687559.n2.n
I tried repairing the Wix install, but no luck. I have VS 2013 professional
edition.
Syntax highlighting is available. For Intellisense, nothing shows up in
listing the attributes for a given xml element. The only available options
listed are !--, 
