1. 5DMk3 - $3500
2. 5DMk2 - phased out to allow for #3, or kept at $2000-$2100 price point
3. entry level full frame (19-36 point AF, 21-22MP, 4 fps, improved ISO performance, digic 5, cheaper body) - $2500-3000
4. 7dMk2/70d (36-61 point AF, 16-19MP, 6-8 fps, crop sensor, improved ISO/noise performance, weatherproof, dual digic5) - $1800-$2200
5. 7d - $1200-$1400 (eventually phased out)
6. 60d - $800-900
5. T4i (9-19 point AF, 16-19MP, 4fps, digic5, crop) - $800-1000
6. Keep T3 ($500-600) for a bit longer, possibly phase out for Mirrorless.
Creating a true 70d under the 7dMk2 would work, just make it less weatherproof, single digic5, 4fps, 24-36pt AF). The above changes would go with their "evolution" model.
1. $1000-1500 (competitor to the NEX-7, Nikon V1)
2. $600-800 (competitor to the NEX-5N, Nikon J1)
With mirrorless, I can see them going two ways: either go with an APS-C sized sensor like Sony/Samsung or keep the 1.5" G1X sensor. The trick is getting their lenses to work. I can see them completely phasing out EF-S lenses (or at least not developing any new lenses) and developing new, smaller lenses for their mirrorless cameras.