Depends on what comes up at the right price. I usually run through graphics cards faster than Lindsay Lohan goes through substance abuse counsellors, but that is an economic decision based on resell opportunity and favourable pricing on new boards.
Any new upgrade will probably centre around storage. As for the "all-new-must-have" tech...DDR4 ? well, you see DDR3 pushing 2800-3000 MT/sec speed so
DDR4 running at the same speed with worse latency doesn't get the heart aflutter. PCI-E 4.0 ? Nah, not really for anything except the aforementioned storage. System bus bandwidth isn't going to be that much of a necessity. PCI-E 2.0 isn't saturated by 99.9999% of graphics cards, let alone PCI-E 3.0. If the next (true) gen graphics include an ARM-based co-processor then the reasons for 4.0 decrease by one.