I answered this question many times, so I'll be short as you will be able to find a lot of info elsewhere on the web. S-37 forward swept wing project...prototype for experimentation, 1 built, that aircraft is now used as Su-47 technology demonstrator (largely avionics) for future fifth-generation Russian fighter and/or Su-27 derivative upgrades. So Su-47 will not enter service or production, and the fifth-generation fighter will probably not have forward swept wings. Sorry to dissappoint you, but that's just what it is according to what I know.