I would put more weight on Conflipper saying it's coming to Verizon, than I would put on the original leak stating it was going to Sprint.
I agree with the expecation of a 4th quarter launch, although with HTC's lineup on Verizon being very thin, I could also see late-September. I am surprised we haven't seen more leaks yet (for anything HTC). Just look at their release history on Verizon:
QWERTY
HTC Harrier - November 2004
HTC Apache - February 2006 (odd delays)
HTC Titan - December 2007
HTC Raphael - November 2008
HTC Rhodium - September 2009
Non-QWERTY
HTC Vogue - April 2008
HTC Diamond - April 2009
HTC Droid Incredible - April 2010
Seems like a pretty obvious pattern to me. Am I saying the Scorpion would be a QWERTY? Not necessarily, but I haven't seen any evidence to the contrary. I would also find it very hard to believe that HTC would have no QWERTY in the lineup with Verizon for the first time in 6 years.