With IB-E cancelled (rumor), does that mean your keeping your 980X forever?
That seems 99% impossible. If Intel did that there would be very little to no reason to get SB-E, even the six-cores. Given what we've seen historically play out, there's some things that stand out:
1. Ticks are small architectural revisions that introduce a new process node. By virtue of having a smaller die on an already existing architecture, power consumption decreases. This also allows for small revisions that couldn't make it before to be implemented. These revisions mean a small jump in IPC, for Intel typically 5% as we've seen going from Conroe to Penryn and from Sandy Bridge to Ivy Bridge. Having a smaller die and lower power consumption typically also means lower temperatures, which enables higher clock speeds. If you have high leakage or high temperature at normal voltage with a new process, however, clock speeds may improve little if any.
2. Tocks are bigger architectural revisions that bring heavier changes, whether it be to the cache, IMC, or the execution units themselves (latency, branch prediction, etc). These result in bigger changes when it comes to IPC, and typically increase clock speeds forward. Going from Penryn to Nehalem we saw a ~17% increase in IPC, and going from Westmere to Sandy Bridge we saw an ~11% increase in IPC.
Now let's assume that Haswell has 10% higher IPC than Ivy Bridge, which has 5% higher IPC than Sandy Bridge. Let's also assume that Ivy Bridge, due to what is already being reported, improves clock speed over Sandy Bridge by 0-5%. Let's assume the situation regarding clock speeds doesn't get better for Intel by the time Haswell comes out because of their quest for efficiency.
Sandy Bridge-E uses the Sandy Bridge architecture, and it's a safe bet given history that Haswell will have around 15% higher IPC than Sandy Bridge. Let's assume the clock speed situation improves little and you can only achieve 5% higher clock speeds on Haswell compared to Sandy Bridge.
This leaves us with a 20% improvement over Sandy Bridge. Six-Core SB-E has a theoretical 50% more computing power than Quad-Core Sandy Bridge, but because of lower core scaling as you add cores even in the most multi-threaded scenarios that becomes 40-45% and in most multi-threaded programs will mean a difference of around 30%.
Now, why would anyone in their right mind pay over twice for a Sandy Bridge-E processor when Haswell will only be 10-20% slower in multi-threaded scenarios, even though it has 50% less cores and much lower power consumption and much lower platform costs? Not gonna happen. Ivy Bridge-E is definitely gonna be released.