What is reportedly a planning guide from T-Mobile which gives some information on the releases expected for November. The document lists November 20th as the launch date for both the Nexus 5 and the Nexus 7. This leak is given added credibility because T-Mobile's website is
This doesn't confirm the release of the Nexus 5, but it certainly helps. Interestingly, the leak also says that November 20th will be the start of Black Friday deals on T-Mobile (despite the fact that Black Friday is the 29th) and will feature deals on Samsung, Sony, and LG products.