Firstly welcome to the forums, you're never getting out
bliviongate:
Now to business, I don't know how long you've been following this thread, whether you've been stalking it for a while or just jumped in, but there is plenty of evidence out there, granted not hard-official-evidence, but we do have our theoretical and our circumstantial evidence which together gives us an idea about what we should expect.
Take for instance your remark that the game would more likely be set in Summerset Isles rather than Skyrim, while I accept the theory that hints towards the next game may have been hidden in the game such as the 'daedra in Summerset Isle popularity' rumor, two critical pieces of circumstantial evidence point otherwise: the first is the claiming of a
legal trademark by the name of Skyrim which has been kept alive for more than 3 years (need confirmation, I forgot how long exactly), now if you've been following the thread then you'd be aware of the massive amounts of money and legal issues that Beth would have gone through to maintain these Skyrim trademarks, and considering that something which Beth has spent years of lawyers and cash on holds a bit more weight than a game rumor, we can accept that Skyrim is a much more likely candidate for the game's location, there is no concrete evidence that says this, but the circumstantial evidence points towards this.
Secondly, there is one key thing which has happened that has possibly demolishing most relevance from the game rumors' suggestions for the next game's location, the TES novels. You may be aware that there was an early synopsis on the Waterstones (book publisher) website, claiming that the book would be the first in a two-part story, bridging the 200 year gap between TES 4 and the next game in the series. This is a quote which has caused considerable controversy because how would Waterstones know that, and if they were making it up, why? The synopsis was shortly replaced (no doubt the work of the Beth ninjas :ninja:) with a slightly less controversial one. Many avid TES fans rushed to screenshot a Google cached copy of the website before it was lost to existence (including myself) so we know that there was something different there. After a heated debated at the time I was personally swayed to the more conspiracy theorist side, that they wouldn't have done that for no reason and someone must have slipped some information, the "200 year gap" suggests that rather than continuing on directly from the story of TES: 4, the devs decided to give a large time-span to re-vamp or give leverage for some lore changes e.g. land-shifts and stuff like that. That is why I have lost any and all faith in possible hints included in TES: 4
TL;DR
Chance of game being in Skrim>Chance of game being in Summerset Isles
EDIT: My oh my, I got so caught up in my little war against 'Summerset Isles' I had forgotten the purpose of this whole post... :facepalm:
REAL TL;DR
There is no evidence whatsoever = false
There is circumstantial evidence that helps speculators reach conclusions on what to expect for TES in the future and what is happening now behind the 10 ft thick vaults of Beth HQ = true (except possibly the 10ft thick vaults comment, this may be a slight over or under-exaggeration on my part)
EDIT numero two:
At 18:38 GMT a user in blue text called 'Dan Ross' is seen reading the forum, not a dev, but interesting to note.
"HI DAN ROSS!!!!!"
......I also greeted said user. End log.