re: an upgrade from economy...unlikely that's going to work. No hurt to ask, but if you're on an award ticket, don't count on it. United would happily sell you an upgrade to Economy Plus (or whatever they're calling it) on their metal - you can see that on their website if it's available and how much they want for it. For the 2 hours from SFO-SEA, not a big deal (OTOH I'd consider it for a long flight). ANA does (I think) offer a paid equivalent on some flights, but IIRC not on the version of the 787 used on this flight (check our SeatGuru.com to check your flight). Even if it exists on this plane, I suspect it's not an option for someone booked on an award ticket in (plain vanilla) economy. I'm pretty sure ANA award seats only come in Economy/Business/First flavors - there's no provision for Economy Plus award seats (even though ANA has those seats on some planes). IME Japanese culture, while so wonderful in so many ways, often doesn't really do "flexibility" well, and in business transactions, expect "the rules are the rules". Generally, this inflexibility works to your advantage (high standards, high expectations, you can rely on that) but if you ask to bend the rules a little, you'll hit a wall. Still, you got bulkhead seats, which are better than average.
You certainly won't have to worry about heat and humidity in November (well, humidity maybe, but without the heat). Tip: if it's raining hard in Tokyo, you can actually navigate underground, as a pedestrian, through large sections of the city. We were in Shinjuku for a couple rainy days in October, and after getting tired of being soaked, we found our way down one level, to a vast series of interconnected pedestrian walkways, passageways, shopping malls, etc - it was like an entire second city just below ground (not funky and tunnel-like, more like an airy, light-filled shopping mall, full of people going about their business). Even better, with an iPad + Google Maps + an internet connection, the underground passage-ways were all mapped in great detail (down to every shop), and it was a breeze to navigate them - we eventually figured out how to get around easily for miles below the surface (if we wanted to). If you have budget, a "pocket wifi" device (provides high speed internet connectivity via cellular signal) is a delight to have along (rent for as long as you need it, arrange in advance, pick up at the airport on arrival, drop off on departure, couldn't be easier). Completely revolutionizes travel in a foreign country. Ah, I miss Japan... :) Have fun.