Should i upgrade to Skylake/DDR4 from Ivybridge?

You already have a very nice PC
I doubt you would get much benefit from an upgrade to skylake.
A better GPU would be nice though.

Just pick up a new GPU and you're set for quite a while. Your GPU is the only thing holding you back.

I don't see any point in upgrading 'just because'. There's no advantage and in an every changing tech industry there's no such thing as 'future proofing'. That just wastes money in hopes that it remains useful longer without knowing whether it really will or not. Features and performance only really matter if you're using them.

So long as the system is still fully satisfying your needs I would stick with it. As others said, maybe a gpu upgrade but again only if it's holding you back. If you're unable to get decent frames per second or having to drop game image quality down to keep fps up.

view this website for a little more info on roadmapping intels new chips, remember, its not all 100% true but it does give a fair idea of whats to come.

http://wccftech.com/intel-2016-roadmap-leaked-confirms-kaby-lakes-10-core-broadwelle-apollo-lake-processors/

and i think you made a mistake in your post, you said wait for 2017 for skylake, but we have skylake now, this year in 2016 were supposed to be getting an updated version of skylake called kabylake which is the same thing with just a few new supported features and sub/semi updated configurations/parts. so maybe you would be benefitted to wait for that, but if the rumours about the new extreme edition chips comming out are true and budget isn't an issue then you'd be looking at one of those, otherwise for 2017 i think your reffering to cannonlake chips which nobody should even be considering about right now.

personally in my own opinion i think you should sit on your set up for just a little bit longer and wait until june-july 2016 just to see where intel is at with releases and then make your decision,

of which i would fully support upgrading to a new chip and the z170 chipset, also i've heard any new extreme edition chips like the 6800k+ will still remain on the x99 chipset so any of those would also require a change.

but what i think your looking at is a kabylake upgrade with the z170 mobo

also don't be so hasty to jump into an r9 390 because your getting 8gb vram, most games your going to be playing which i'm assuming your aiming for 1920x1080 won't even come close to actually utilizing that much vram and on top of that amd cards have been widely known to have huge heating issues and much higher temps when running than a gtx.

for 150$ more you'd be much better off getting a gtx980 than anything amd, you absolutely do not just pick a card because it has more ram, you need to, for your own clarity of mind, look up solid reviews and benchmarks with games and fps ratings to see where your own usage statistics would relate too.

I have a 970M in my new laptop which isn't even remarkably close to a desktop 980's performance and I run assassins creed syndicate on high detail at 1920x1080 with 55-60 fps average and almost always a minimal gpu temperature

And dont forget that both amd and nvidia are releasing new gpu's in 2016 as well, i dont specifically know the codenames of the amd ones but i know that nvidia's is pascal gpu's.

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here's an example, and don't forget that the r9 390 is still based off the amd hawaii chipset and is only a renamed r9 290 with double the vram and enhanced clock speed, so it's still based off of an older gpu model

http://linustechtips.com/main/topic/510628-fps-and-temp-issues-with-r9-390-plz-help/

don't think that i'm hating on amd because its still a good gpu, you just have to have an extensive amount of properly set up cooling in your system which can cause excessive fan noise in most situations because this gpu requires extensive cooling to remain at a solid temp speed so you don't receive fps drops from overheating.

If you read through that thread, the OP there was running the original "Crimson" driver that had the fan bug, which has been corrected since December 16th. Plus, not all R9 390 coolers are created equal. The Sapphire one I have has yet to go over 60c under load with the fans around 34%, and that is running Fallout 4 on Ultra settings. The thing to look out for mainly is room for the card, the one I have is very long, but with 3 fans it's running cool and quiet.

No problem ,its not about preference or fanboying anything, it really doesn't matter to me what card you purchase, i just want you to make a purchase decision based off of reviews, benchmark tests, youtube videos detailing problems and fixes and long term usage reports and overall opinions from several people.

Rather than just jumping into a buy because you see double v ram for a semi cheaper price point.