So I was able to break the barrier on Forge Island last night and took several screenshots.
First here is a view showing the three islands (top center). The white faded area is the boundary/barrier of Forge Island.
From here, I looked up to see the inner hull of the Shield Wall. 
Then I zoomed in to see more of the detail: 
Here is nearly the same as the first pic, but a little higher up and turned almost 180. The island on the left has some of the “anvil” type islands attached to it, or very near it. The big island to the right is the same as the other island with some minor derivations. The size is a bit smaller and the texture shaded differently. However, since their orientation to the 3 “Great Anvil” islands of Forge Island themselves are different, these far off islands appear to be different somewhat when view from the normal map level.
Finally, there is one of these same islands further off and MUCH MUCH bigger. So much so that it follows the curvature of Requiem. I’m calling this island, “Epic Island.” It’s quite beautiful. (Click to make bigger)
In that above panorama, I had to piece together 4 screenshots and rotate slightly to get to line up.
I wish THIS island was for use in Forge. Given the size (even if it was one of the smaller, but same shaped cousins, we would have a gargantuan island to forge on with some truly unique play spaces. Not to mention beaches by which to forge next to, instead of the anvil islands, which have no beaches persay.
Hmm, maybe we can convince 343 to give us this too? It’s already made… Heck make it much smaller so the texture appears as high-resolution. I’d be fine with that. I want to play/forge on this island!!!
-Sal