Hey everyone :)
The new datatype for mathematical expressions is now enabled here. As soon as properties using it are created they'll show up at https://www.wikidata.org/wiki/Special:ListProperties?datatype=math. At https://en.wikipedia.org/wiki/Help:Displaying_a_formula you can find out more about the supported syntax. Thanks to Markus the Wikidata Toolkit supports it as well already: https://lists.wikimedia.org/pipermail/wikidata/2016-February/008169.html
Cheers Lydia