SpikeTV doesn't broadcast in HDTV.
Even if you have an HDTV-ready television you can only pick up an HDTV signal through channels made specifically to broadcast HDTV.
My digital cable company has CBSHD, ABCHD and a few more channels.
So basically WWE will be recording and broadcasting an HDTV signal - but it's still shown over an NTSC channel via SpikeTV negating the quality.
Now this HDTV recording equipment will, however, allow for greater video clarity on future DVD releases.
But until WWE broadcasts on an HDTV channel, the visual difference every week will be minimal.