Speaking of Ewoks, if the wrecked Death Star is in fact the Death Star II and that planet is Endor, a small part of me would love it if Warwick Davis briefly reappeared as an old battle-scarred Wicket, now the chieftain of his tribe, who has grey, matted hair, is blind in one eye and is missing an ear. Maybe 3PO could use his god credentials and ask them for directions to the Haunted Coast!
If they are being details and accurate then the wreckage we see is Death Star I and that would be the Yavin system. I compared the ROTJ superlaser and the ANH superlaser to the trailer and what we see in the trailer matches the details of the ANH superlaser.