See http://hamspots.net/10-6/ .
I see on Hamspots that 6m has been open to N.America and the Caribbean this evening but there are NO suitably located stations active on WSPR. It seems WSPR on 6m is mostly a total waste of time unless stations come on to make transatlantic WSPR tests meaningful. In previous seasons I have monitored SSB and CW and had success copying transatlantics for as long as I can recall.
I am not returning to 6m WSPR in a hurry. It's a great pity. Next Es DX season I think I shall try again on CW and SSB again.