Looks like HP has confused its product release order of operations. Without even a hint of an official announcement, the HP 210 netbook has appeared in two quadrants of the internet: retail and troubleshooting.
The former is eCost, which claims the 10.1-inch matte black portable is in stock for $390 and touts a 1.66GHz Intel Atom N450 (yep, that's Pine Trail), integrated graphics, 1GB RAM, 250GB HDD, and a 6-cell battery. As for the latter, we need look no further than HP's own support pages...