Nowhere near price competitive with the HPX170; you can get a new HPX170 including the free 16GB P2 card for $3995. And the HVX200A appears to be going for $3895.
As far as Canon MSRP vs. street price, according to B&H:
XLH1S: $8999, B&H $7599
XLH1A: $5999, B&H $5299
XHA1S: $3999, B&H $3395
So street price looks like it's about 12% to 15% less than MSRP.
Which means that the XF300 might street at around $5800.
Maybe I'm misunderstanding but the price of the XF300 in B&H as of today is (4/25/10) is $6,799. So when should this price drop 12-15%? A couple of months after its release?