Mostly I'd suggest this:
https://www.mynissanleaf.com/... but I own a 2015 Leaf, so I'll have a go at giving an opinion on a few of your questions ...
1. Is there battery degradation on this car and if so, what is the current charge is for the battery (i.e. how many miles per charge)There most certainly will be.
Don't ask "how many miles per charge" b/c that depends highly on route/style/weather/etc.
Typically people will talk about "how many bars of capacity are left" (or are "lost"), referring to the on-dash capacity display.
2. Typically how much longer do you think the battery will last past it's current period?I don't have any real experience here. The forum may give you a broader perspective.
3. For my type of driving (less than 50 miles/day), can I do this with a normal plug in to the wall outlet, or do I need a 240V specially installed? I'm trying to figure if installing a high speed charger makes financial sense.I would think you could do it with a normal plug-in to the wall.
Back before the end of times, I would drive 20-25/day, and had no problem using my normal plug-in.
4. Is there any "normal maintenance" beyond tire rotations? I am trying to determine what my normal maintenance would be like.
I've not had anything other than tires in the past ~2.5 years.
Eventually I may have to replace the brake pads, but they last much longer on a Leaf (due to regen brakng) than you'd be used to from a ICE car.
5. If the battery does significantly decline, is there an option to replace the batter to get "full charge" again? If so, what is the cost for this?
Check the forum.
In theory, yes. I think it's around $6k + labor. I don't know that people actually do it, or that it's readily available in practice.
6. For battery replacement, if this is an option, is there the possibility for an "upgraded battery" where I can get beyond the 80 or so miles at full charge (so can I replace the current battery with a new Leaf battery that gets 200 miles/charge?)Check the forum.
Not from Nissan, I don't think.
In theory, there's an article about some 3rd party who would do this, but again, may not work out so well in practice.
7. If I were out and about and the battery died b/c charge was lost, is the only option to tow the car to a place where I can charge it?If you were unable to get-to/find a higher level charging station, then your best bet would be to travel with the "normal wall outlet" charger in the car, and use your last bit of juice to get you to a wall outlet somewhere. That'd slowly restore some miles/charge, but you'd be waiting for a while.
Also, I've heard that there are portable L2 chargers, and that some towing/roadside-assist vehicles may start carrying them. But I wouldn't bet on it.
8. How long for a full (or 80% charge) from a normal outlet vs a high speed charger?Lots of data on the internet for that.
I'd suggest that if you're planning to use a normal outlet, that you should really just think of that as an "overnight" solution. Or perhaps a "for 8 hours while I'm at work" solution. You can't count on it to charge a useful amount in a short time.
9. I read something about pre-2013 Leaf's having an issue where you can over-charge the battery or something where you have to be careful about how to charge, is there anything to know about the pre-2013 Leaf vs. 2013-Present?Check the forum.
I don't recall seeing such a thing myself. Maybe what you heard was about over-heating rather than over-charging?