What do these icons in Xcode 4 stand for?

Question

I've never seen these before, but what are the little 'A's and 'M's next to the filenames in the file browser for?

Answer 1

Let me guess from the knowledge of SVN -

A => newly added file.
M => modified an existing file.

Answer 2

this in relation to Source Control (git or Subversion)

check this page

Save and Revert Changes to Projects