Strange MiG-29s at Lukhovitsy

Spotters caught these several MiG-29s at Lukhovitsy.. I can recognize the 357 which should be MiG-29SM, but what are the other ones, #147, 148, 149 and 150?

Look pretty much new-built, two of them wear very unusual wraparound grey coat and you can also notice R-77 RVV-AE without tail grids mounted on the pylon #5 of the 148. Any ideas from Arthur, Ken or other Russian freaks?

http://www.airliners.net/open.file/658048/L/
http://www.airliners.net/open.file/658047/L/
http://www.airliners.net/open.file/658046/L/
http://www.airliners.net/open.file/658022/L/
http://www.airliners.net/open.file/658021/L/