Looking forward to this architecture; it'll be interesting to see if it's really worthwhile upgrading from my current setup when released; as realistically, my 2700K at 4.7GHz isn't exactly struggling with most things, and the IPC gains/reduced clocking from the newer chips has meant the gains so far just haven't justified the cost.
I am sure my Z68/PCI-E 2.0 is probably holding back my R9 290 a little, even more so if I was to upgrade to crossfire or 3-series when they arrive; which'd be in tandem with DDR4 (my system just doesn't like DDR3 over 1600MHz) and newer/larger SSDs
Zen will also be interesting if the higher core numbers and 40% IPC improvements hold true.