The V10 5 series upgrade of the current E39 M5 will still be called M5, the 6 series you guys are hearing about is the new coupe. If you guys are interested in either go to either
http://www.bimmer.org or
http://www.bmwm5.com I bought a 2001 M5 for msrp and sold it for 5k less after 2 years and 20k miles. How expensive the car is is only relative to the difference between how much you buy it for and how much you sell it for. you guys may find this surprising from a Viper owner but I hated the M5 in the DC beltway area where I live, that car has the worst clutch ever devised by man, the engagement point is 1/2 inch off the floor, extremely hard to drive smoothly. Lots of dieseling noise from the Vanos system, big whine from the rear diff. First gear so short you are always hitting the limiter......and oh yes...BMW dealers, after Lexus and Infiniti I was spoiled...brought the M5 in for it's first service at 5k and they bring around a 1996 2 door bottom of the line loaner with 78k miles on it and holes in the console where the power window switches were supposed to be...that was it, I drove the m5 until the opportune window to sell and I will be doing Infinitis again for quite a while for my sedan and suv needs. I mentioned it before but it bears repeating, the M5 is a fast car but from about a 60-70 roll up to 120 or so the Gen 1 Q will stay right with it and it feels much the same, take it from someone who owned both at the same time. I'm a lot happier in traffic in the old Q too. Now bring on the new 2005 M45 with a little more horsepower, that's what I'm waiting for next spring hopefully.