I've also seen some reports on this. Looks like Mobil is going to cash in on the cheaper group 3 base stocks. Group 3 is still classed as synthetic so most consumers will never know they are NOT getting a 'true' synthetic. I think this sucks.
Not that group 3 synthetics are bad. They are very good quality but you can be sure Mobil is not going to lower their prices. Its a cash-grab in my opinion.