So, the general opinion of Eureka is that it looks to take place on the Isle of Val, evidence for this is, the part of the trailer showing Eureka, begins with Krile, the sole survivor of the incident on the Isle of Val, mentioning that she is hoping about something or other (or trying not to hope for something or other)
We also see this structure
Which is reminiscent of the Sharlayan colony in the Hinterlands, especially the dome like structures
We also see the WoL being approached by a robed figure, you might think this could come from the MSQ, but note the lamp
We then see this group surrounding a lamp, which people suspect to be the Dawn Warriors from FFV, one of whom was Galuf Baldesion, who likely died when the incident happened on the island
Of course, these scenes could be from the MSQ, but they're grouped together around Eureka, and all seem to be themed around Sharlayan and the Students of Baldesion.
EDIT: The lamp also looks ornate and has the same colour as the ones seen in Idyllshire/Dravanian Hinterlands
Also, forgot to mention, the Aetheryte in Eureka looks to be of Sharlayan design, an older model than those seen in ARR, closer to 1.0 style ones
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