These are the specs that I'm guessing the next iMac will have...
- 30 inch screen (with touch screen capability)
- 8-core processor
- 1 TB hard drive
- 4 GB RAM
- Blu-Ray Drive
Well, maybe that won't happen.
You guess wrong since there is no consumer grade 8-core chip.. The Mac Pro achieves it's 8-cores with 2 CPU's. Don't plan on seeing a consumer grade computer with 2 CPU's any time soon.
30" LCD displays just cost way too much money and there is not a whole lot of reason to have one. (Since the 24" already supports full HD). Adding touch screen capability just makes it that Much more unlikely.
You can already get a 1TB drive and 4GB of memory with your iMac.
Blu-Ray drive is very possible to be included as an option.