Did MSCA supersede MCA or do both still fund new projects?
The MCA page is indeed out of date. 
See e.g. http://ec.europa.eu/research/mariecurieactions/about-mca/actions/iif/index_en.htm
where if you click on "How do we apply", there is a link to "People Work Programme 2013".

The name MCA was changed to MSCA with the end of the 7th Framework Programme (FP7), and the start of Horizon 2020.