Another day, another re-brand, this is getting a little too much.
Looks like they are trying to fill the void left by the shut down of X-treme Sports. I suspect it will continue to air in HD, if it doesn't then that is a huge step in the wrong direction IMO. High Fidelity did apply a while back for SD versions of their channels, not sure why?!
Why the name change for Equator HD, perhaps they don't want to pay license fees to Rainbow Media anymore (they owned VOOM, Rush , Equator & Treasure are all VOOM branded channels). If that's true, then expect to see Treasure HD change its name as well at some point.