MSYS2 based tools are now available for download.
Tools updated to version 2016-01-04, if you have some of previous versions please update.
In case you have version from 2016-01-03, just do : git pull in root of your tools to update
scripts, and then check if file usr\bin\sh.exe.old exist, if so rename it to usr\bin\sh.exe
Start your environment and enjoy.