TJ3TS (5478km) in Cameroon has just been spotted here on 10m WSPR. This is the first "real" DX that has been seen so far. I suspect greater distances will be logged soon as the band "warms up". Pretty sure this is F2 propagation.
UPDATE 1100z: CX2ABP (11127km) has just been spotted for the first time today on 10m. 4X1RF (3519km) has spotted me a few times already.#
UPDATE 1330z: My first USA spot was at 1200z. Plenty of stateside stations since then. The 10m band is well open to the USA.