I do not have an answer or solution for this, but I looked into it and I can share the challenges I found, if anyone is interested in this, maybe will find them useful.

Cannot set targeting by code (Div ID).
The GPT adunit definition doesn't have a code:
googletag.defineOutOfPageSlot('PUB AD UNIT PATH HERE', googletag.enums.OutOfPageFormat.INTERSTITIAL).addService(googletag.pubads());
Of course, GPT generates a Div ID for it, but not being able to set one custom in the adunit definition will make it hard for most of people implementing it. You can set the targeting by adunit, or there are ways around it. (if you know the adunit name, you will know the div id generated by GPT)
The interstitial is an iframe and the creative in a nested iframe. This means that the Prebid Universal Creative will need to "jump" two iframes to get to the prebid global object.
A solution here is to use window.top instead of window.parent for render function, but for us (we are managing a variety of sites with different implementation) this is not a proper solution across the board. There are implementation when prebid's global object is not within window.top.
I guess window.parent.parent will work, but I think the PUC needs to know when to call this and when to call window.parent.

Same things apply to cross domain creatives (if using safe frames), with window.parent.postMessage.

I think there are solutions, but not without changes to both prebid.js and PUC and I cannot say what would the best flow here. (maybe adding a new mediaType). For us the investigation stopped here, since seems that there is a lot of work ahead and if the header bidding demand partners will see this inventory as standard banner, what is the benefit of implementing it. Google's demand is 2-3X over the standard banner, so HB demand partners will not have a chance competing with standard banners here.

Uh oh!

Integration of mobile web interstitial ad with prebid #5917

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