I think we'll see a repeat of the second Apollo G4 lineup that was 733,867 and dual 800.
something like :
1Ghz, 256Mb, 60Gb
1.4Ghz 256Mb, 80Gb
dual 1.2Ghz 512Mb, 100 or 120Gb
1, 1.4 and dual 1.2Ghz sounds realistic if heat really is an issue, plus someone overclocked their dual 1Ghz to 1.2Ghz and did some benchmarks shortly after the dual Ghz model was released. it seems realistic to have the second fastest chips as a dual with the fastest as a single. also it would make for a very fair spec across the range, the mid range would be 40% faster than the entry level, more so if they cripple the entry level with no L3 like they keep doing. The top of the range will be faster than the mid range for anything that's dual CPU aware, the mid range will be the most value for money model, especially if you can strip it down like now and make it the same spec as the entry level but with a larger hard drive and the faster CPU.