Resolution was never a disadvantage of TN, there just was no one willing to make anything above a 1080p panel using the tech, as most users of higher resolutions wouldn't want a TN. With the 4K hype that looks to be changing.
With all the inherent IQ disadvantage of TN, I think a high resolution TN screen would be about the most disgusting monitor you could buy with those issues amplified by the higher resolution.
Hopefully some IPS panels with gsync get announced. 120hz I am not so interested in with reviews of gsync saying it's best usage case is for sub 60fps with framerates above that not making much of a difference using gsync.
Resolution has never been an option, so yes, that has been a disadvantage.
What makes you think higher resolutions cause the TN problems to be worse? What makes you think the TN problems can't be improved? The Samsung 120hz TN displays used to get a lot of IPS users to switch back for 120hz, because they were good and many thought the color was just as good as their IPS screens.
Yes, I hope IPS monitors will be released as well. I doubt I'll buy one, but it will give more options.
Now the big question is if IPS will work with G-sync well. It does appear they are targeting fast response times. It could be they are doing it because the G-sync chip offers 2 modes, the lightboost like mode, and v-sync alternative and they want both modes to work well.
Anyways, these are good options. They are improved from what we had before in terms of the Lightboost and G-sync options.