Season 8 of "Scrubs" explained at last.

Originally season 7 was due to be "Scrubs" last. But due to the writer's strike, series creator Bill Lawrence was unable to wrap up the series as he saw fit. Being a huge fan of the show from day one, that meant that he'd be unable to wrap up the series as I saw fit, which is really what's important.
NBC has never treated the show with the respect it deserved. To their credit they have renewed it year in and year out and given us seven years of one of the funniest and most inventive shows to ever hit television. Still, while they've been giving glowing advertising to "My Name Is Earl," "The Office," and "30 Rock," they've been treating "Scrubs" like their adopted daughter Margot Tenenbaum. For evidence of NBC's shabby treatment of the show, you need look no further than last night. The network claimed that last night's episode would be the series finale. In fact it wasn't even a proper season finale. As anyone who's paying attention knows Dr. Kelso (Ken Jenkins) retired from Sacred Heart Hospital two weeks ago. Yet last night there he was, still wearing his coat, treating Ted badly, and biting the heads off of everyone in sight. The episodes were aired out of order. If that isn't a complete lack of respect for a show I don't know what is.
But here comes ABC to the rescue. Disney owns the show after all, which means that they get all the revenue from DVD sales and syndication. This, more than anything else, explains why NBC has treated the show the way it has. Here is how it's all going to work, according to Canadian website, dose.ca. (Thanks to Brian for the link!):

Stop your whimpering, Janet, because Scrubs isn't flat-lining just yet. John C. McGinley, who plays Dr. Cox on the quirky NBC comedy, told the National Ledger yesterday that the show will see an eighth season - but this time, they're moving to ABC.

"I've been told to show up at work on March 24, and the 18 episodes we're going to do starting that day will be on ABC next fall," said McGinley.

Last year, NBC ordered 18 episodes of Scrubs for what was to be its final season, but the show only managed to get 12 episodes in the can before the writers strike hit. The network was initially reluctant to commit to the final six, prompting creator Bill Lawrence to tell the press that he would put the last episodes on DVD if necessary, but when ABC offered to bring the sitcom to their network next season, NBC agreed to air the back six of Scrubs starting April 10.

Bob again. So yes this article is a little old as you could tell, but we just found it now...so deal with it.
Knowing the writing staff of "Scrubs," I'm sure there will be some clever references to the change in the series premiere. Sure the show isn't as great as it used to be, but it's still far funnier and far sharper than most everything else on television. Besides, now we can see how Bill Lawrence really wants to finish up the story. I'm looking forward to next year.