There is more on this cancellation on pokerstrategy.com. One of the hosts of HSP, A.J. Benza seems quite upset at this cancellation. He said the following:
"'Far as Gabe [Kaplan] and I know….the show isn't coming back. Apparently…the network is going to go in a different direction and that ain't good news for our show, especially since we skew a higher-aged audience. Never mind that we’re the network’s No. 1 show. Still and all, no one calls us from the network to say squat. Only Kevin Belinkoff checks in periodically, but it just don’t seem like good news. If you ask me…they’re treating us like ____. All we ever did was make them a bunch of money."
From that same article, it is said GSN is making a new poker show. So it seems they are not going away from Poker, just away from HSP.
Source: PokerStrategy.com