Evil.Shieldmaiden wrote:
I look forward to reading your review. 
Well, for my comprehensive review (aka babbling excessively) see CoE.
FoG is very similar to Beren & Lúthien in that it compiles that variations of the tale written overs several decades, and published in several volumes of HoMe respectively UT (in the latter, the very detailed version in which Tuor does not even enter Gondolin despiten its length). The last third (of in total 300 pages, font size and line distance seem to be comparable to the 2007 "The Children of Hurin" and last year's "Beren and Lúthien") covers the "Evolution of the Story", and CRT's explanation about why the Gondolin tale (with Eärendil, Elrond and Elros) is more central and decisive to the whole legendarium than CoH and B&L. Both of these tales could stand as solitary stories, ending before the end of the "First Age", which only became a "First Age" with an end to it due to Eärendil's efforts. Then Elros mutates into the first and greatest king of Númenor, the central story of the Second Age, and Elrond has things to do in the Second Age and the Third Age. The turning point, of course, is Elrond (for quite a while the only child of Eärendel and Elwing, Elros is a late addition), sneaking his way into The Hobbit, and all that came after.