You're correct. Normally, the next Bachelor/ette comes from one of the final candidates. It's been that way now for several seasons. That's why I laughed when CH announced, "Due to overwhelming response..." Clearly MF and company knew they couldn't pick Drew the Dud (which is what the blogs had been saying would happen). They knew that they had to do something to woo the fans back who were going to leave after this snoozefest of a season. And once again, kudos to TPTB on this show. They hit it out of the ballpark by picking Juan Pablo!
Ok, now somebody tell me how to upload a photo into your avatar. I want to put the new Bachelor in.