Unless I badly missed something, Broadcom is still coming this year, just Summer/Fall. I still haven't seen anything concrete on this Haswell refresh. The best I am getting is Broadwell's chipset will debut with it, and we'll get minor clock speed bumps on Haswell processors, which happens almost always on Intel's product lines. I think Ivy was the last time we didn't see it (or maybe we did and I missed it?).
That happens sometime this spring with Broadwell still expected in at least limited numbers this summer.
I know Sandy, Nahalem and others had that tick, minor tick, tock, minor tock going on.
i5-2500...and then 9 months later, i5-2600 and so on.
Generally Intel improves their process and yeilds and the end result is 8-10 months on we get a new release of, generally, 100MHz clock bumped processors at the same or slightly higher price points to what Intel initially released, often times with slight real world power savings (but the same TDP).
Intel has acknowledged issues with 14nm, delaying the release by roughly 6 months according to them.
Try TSMC and GloFo who have mostly conceeded that 20nm is/has been delayed a minimum of 12 months off their originally projected time line (of 2 years after 28nm). It sounds like they'll be likely if there are ANY shipping 20nm chips from any of the fabs before the end of the year, looking more like early/mid next year is much more likely, putting them 2 full nodes behind Intel for at least 6-12 months.
I think these smaller nodes are proving much more difficult for everyone. If the newest EUV lithography gear proves effective, it might change that, maybe, but things don't sound promising even with it. Intel has talked about playing with 10nm in the lab and I know some universities are working with 6-10nm too, but I am not terribly confident that 10nm is going to be able to be ready 2 years after 14nm for Intel and below that...well, it may not be workable (Intel has prototype 10nm according to them, so I assume that means they will be able to eventually take it to a shipping product. Eventually).
Below 8-10nm we might well be talking needing something other than Silicon to handle the smaller sizes, or a hybrid silicon doped with something. Or maybe nothing will work as a transistor effectively below those sizes and we'll have to develop effective photonics if we want to increase performance per watt.
We can increase processing power density by chip stacking at some point, but that doesn't solve power consumption/performance per watt, which is the overriding issue for most computing.