I was not expecting the episode to end in that way at all. I really hope this isn't the end, has anyone trolled the internet for news on it?
I'm constantly trolling the internet....
This article, published in March is interesting.
He won’t have long to do so. A week after they leave New York around March 28, the pair hurtles into the 15th season of South Park, part of a new pact with Comedy Central that keeps the show on the air through 2013 and is said to be even richer than their previous $75 million deal. They’ll have just one week to create each episode, with no time to prep.
“Every show, we’re down to the wire,” says Parker, running his hand through his hair in exasperation. “I don’t know how we’re going to do it. It’s a nightmare.”
So, contractually, it would appear they have to keep the show running.
However, I wouldn't be surprised if the mid-season finale was a precursor to the end or set things in motion to end this season. I think that with some of the episodes this season, it became quite clear that the creators are burnt out and I'd rather they end it with 7 good episodes, with the finish clear in sight than try and carry on for a couple more seasons with the show drifting to s**t - that's what the Simpsons have been doing for the last decade.
Although, knowing them, it also wouldn't be at all surprising for the next part of the season to begin with no reference to this at all and for SP to continue as we know it until 2013.