There is! Just look out for the statusbar of MC. You'll find it at the bottom of MCs window. In every view you are able to see, how many files are in current active view. Here is a screenshot:
(http://www.pix01.com/gallery/BD01FC74-5847-4306-A29B-3AA1BF99BB82/Statusbar/534052746_orig0.jpg)
The info disappears for the time MC is writing tag changes but reappears if this is done.