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You know what, when I suggested boxing-in the pad and laying pavers over top as a possible solution, I didn't take into account that you want to actually extend the area beyond the size of the existing pad. That'll teach me not to speed-read posts.
With that in mind, I would agree with others that you'd be opening yourself up to settling problems where the extended portion would in time no longer match up flush with the part over top of the pad. So disregard my original option and go with the demo-first plan.
Fortunately, unlike AZTLANLC I've never extended a patio over poured concrete and had it heave. However, there was a job a couple of years ago where we discovered a mysterious "foundation" for lack of a better term on a backyard patio job. I did run the pavers over top in that case but first I actually raised the grade of the entire patio to allow for that, so the foundation/wall underneath was no longer at the surface. The homeowner, nor I had any idea what the foundation would have been for. It was a square about 5'x5', open in the center like a big sandbox. The concrete went down about 24" too so I wasn't about to try and break it out of there. After discussing it with the homeowner we decided to leave it in.
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