As sweet as it will probably be, give a year to work on quality control and teething problems, especially things like bearing wear...after my ride today on my ASR7, I don't regret just buying it at all, especially on the closeout price from Competitive Cyclist. I got my ASR7 for $700, after which I don't think I can ever justify paying full MSRP for the new kid on the block with yet to be determined reliability.
Get a 575 when they come down and price and ride and love it till the new SB66 comes down. 1/4" or 7mm of travel difference? I can't see the 575 sticking around for more than another year or so, but if you can get new 575 for $1000 less why not? .