So, here is some inspiration for if the next TES is set here. Good place to continue Thalmor and Aldmeri Dominion politics and so on.
Landscapes
http://paizo.com/image/content/SecondDarkness/PZO9017-ElfTowerTown.jpg
http://images2.wikia.nocookie.net/__cb20100706030450/finalfantasy/images/9/98/Crystal_Tower_Artwork.jpg
http://s.cghub.com/files/Image/459001-460000/459517/989_stream.jpg
http://i740.photobucket.com/albums/xx42/burt_reynoldz_mustache/Pathfinder/Kyonincity.jpg
http://imgs.mi9.com/uploads/fantasy/916/fantasy-landscapes_1024x768_13243.jpg
http://www.wallpaperup.com/uploads/wallpapers/2012/12/08/23956/058d21cff2bdcf706907142609cd6c82.jpg
http://img79.imageshack.us/img79/7677/skyforge.jpg
http://www.nguwuh.com/images/t/1680x1050/315-fantasy-landscapes-1680x1050.jpg
http://www.wallmay.com/thumbnails/detail/20120326/final%20fantasy%20landscapes%201600x900%20wallpaper_www.wallmay.com_4.jpg
The psijics island could appear in summerset isle. It could play as a sort of Mages Guild/CoW quest line. Maybe even include them in Altmer politics. Some inspiration.
The island could be floating in the sky.
http://25.media.tumblr.com/tumblr_lxspp7Vu7w1r4v2bso1_500.jpg
http://hellpapers.com/wallpapers/434/cityscapes%20flying%20gravity%20hover%20floating%20island%20skyscapes%20city%20in%20the%20sky.jpg
Better oceans/lakes/water.
http://farm4.static.flickr.com/3437/3944698335_19645bb1a8.jpg
http://cache.desktopnexus.com/thumbnails/63079-bigthumbnail.jpg
http://sevendesktop.com/wp-content/uploads/2013/02/Eagle-Creek-and-Emerald-Bay-at-Sunrise-Lake-Tahoe-California-Desktop-Wallpaper.jpg
Better clothing. Elven clothes etc.
So this is mostly what i have. I think the more beautiful the landscape is, the better. I love playing in a world of beauty. Skyrim was beautiful but was missing a lot of the fantasy sort of elements.