Retina mini will go for $299 and the old mini for $199-229. That's how I see this going down. This leaves the iPod touch in a weird spot though. I could actually see it dying this year or next. The iPad mini can serve as the gateway drug at this point.
Apple could drop the iPod Touch down $50. That would get the entry iPod Touch under the psychologic $150 barrier. It may not necessary set sales on fire, but it'll definitely stabilize if not renew interest. A 6th gen A6 based 32GB iPod Touch at $249 would also be very distinct from a 1st gen A5 based 16GB iPad Mini at $229. It would also give them room on the top end to introduce a 128GB iPod Touch without the price seeming too extreme ($449 vs $499). A 128GB iPod Touch might also coincide with the iPod Classic finally being discontinued and the iPod Nano also sliding $50 to get under $100 might also temporarily stabilize interest in the pure mp3 player market.
I could see a 2013 lineup as:
$49 4GB iPod Shuffle
$99 16GB iPod Nano
$129 32GB iPod Nano
$149 16GB 5th gen iPod Touch (32nm A5/SGX543MP2/512MB)
$199 32GB 5th gen iPod Touch (32nm A5/SGX543MP2/512MB)
$249 32GB 6th gen iPod Touch (28nm A6/SGX543MP3/1GB)
$349 64GB 6th gen iPod Touch (28nm A6/SGX543MP3/1GB)
$449 128GB 6th gen iPod Touch (28nm A6/SGX543MP3/1GB)
$229 16GB 1st gen iPad Mini (32nm A5/SGX543MP2/512MB)
$329 16GB 2nd gen iPad Mini (28nm A6X/SGX554MP4/1GB)
$429 32GB 2nd gen iPad Mini (28nm A6X/SGX554MP4/1GB)
$529 64GB 2nd gen iPad Mini (28nm A6X/SGX554MP4/1GB)
$399 16GB 4th gen iPad (32nm A6X/SGX554MP4/1GB)
$499 32GB 5th gen iPad (28nm A7X/Rogue/2GB)
$599 64GB 5th gen iPad (28nm A7X/Rogue/2GB)
$699 128GB 5th gen iPad (28nm A7X/Rogue/2GB)
+$130 for cellular on iPad and iPad Mini