You beat me to starting this thread. lol
I like the 4 Series concept, and I think the production version will likely be brilliant. I think that this will be a good competitor for the E-Class coupe, which, to me, has always seemed like more than a 3er but a lot less than a 6er.
I love the new headlights - I'm a sucker for those LEDs. The interior, while better than the plasticky (albeit higher grade plastic than most cars) 3 Series, doesn't quite stack up to competing with the 6er when fitted with the Nappa, contrast stitching, and ceramic controls.
I don't think the 6er has to worry about losing its price...
1. Price: It should be a lot closer to 3er/5er price than the ridiculous 6er price, which, as we all know, is about $15k to $20k more than the equivalent 5 Series. The number of 4ers on the road will likely dilute the exclusivity - or at least keep the numbers closer to 3er territory than the scarce 6ers.
2. Looks: While I think the new design for the 4er is beautiful, the massive, long and low 6er can't be beat in a car so much smaller. The proportions of the 6er give it presence that smaller cars can't touch.
3. Power: I, and I think others here, love the big, grumbly V8 only available on the 6er. I know the day is coming where big V8s are going to be extremely rare, and I think the flagship 6er is likely going to be one of the last cars in the Bimmer lineup to hold onto the V8.
That being said, I think the M4 in Individual packaging just might be my next car - not sure but it's more likely now than with the previous gen M3. I love the M3 for driving, but the M3's interior just didn't cut it. The inline 6 for the new M3/M4 is rumored to make about 450+ hp, and that packaged into a lighter, more nimble car with Merino, Alcantara, and the best tech BMW has to offer is very tempting, particularly if it stays in the $80k to $90k range. But then there's the M5... No idea what my next car will be, but my point is that I think the M4 is going to be a formidable vehicle.