yes, I had to look it up too.
Here it is...
consists of two layers of cake full of chopped pecans, crushed pineapple, and mashed bananas that are filled and frosted with a delicious cream cheese icing.
Read more: http://www.joyofbaking.com/HummingbirdCake.html#ixzz11i3btXE2
I always try to accomodate special requests - unless it's a dietetic change. I don't do gluten-free, nut-free, etc..
I already charge a little extra for German chocolate, Italian creme, key lime curd and spirit -infused flavors, so I'd definitely charge extra for hummingbird.
I would also strongly encourage the bride to limit that filling to one tier - or - just one layer of filling in a torted cake with other fillings (or just bc). That way, if someone doesn't like it, they can eat the cake and other fillings that surround it.
It looks easy enough, I would agree to offer it, at a premium price of course. Hummingbird cakes are popular in the south so you may want to consider adding it to your regular menu as a premium item (unless it turns out to be a PITA to make).
yes, i always offer to make another flavor of cake if they want one that's not on my menu. But i do tell them that it may be at an additional cost depending on the flavor. Then once they bring me the flavor i can figure up if there is an additional cost.
And yes, hummingbird uses a lot more ingredients than my basic recipes so i do charge more for that (along with some alcohol flavored cakes)
Yes, as long as it's something I think will taste nice. I like to expand on the cakes I offer and it gives me incentive to perfect new recipes. Hummingbird cake is lovely anyway, good luck with what you decide 
Yes, provided there is plenty of time before the event to test recipes. I would charge extra, unless it was a flavor I had been wanting to try and just waiting for the excuse!
Hummingbird Cake is FABULOUS! I requested it every year for my birthday until I moved out of my mother's house. It's definitely worth adding it to your menu. It's really moist, so I wouldn't want to use it as my base layers. But sooooo worth trying it out! Make a trial run for your family and then decide if it's worth the hassle. (It would be for me!) 
I love, love, love hummingbird! I once put those dried-in-the-oven think pineapple rings on top and it was out of this world!
I hope the bride is willing to pay for the extra hassle and ingredients.
The Cake Mix Doctor also has a version of the Hummingbird cake in her book. very tasty!
I've made hummingbird cake for several years now. It's a family favorite. To me, it's sort of like a banana bread or pumpkin bread. Feels like it could be a breakfast item. Very tasty and super moist.
I've only put ground walnuts in mine though. Pecans would be great too. I'll try that next time. The cake I make is a bundt & has a drizzle using extra pineapple juice & p.sugar. It is a heavy cake.
I'd prepare for any assembled cake transportation issues before hand. It will be a doozy, seriously if you have all layers with this heavy cake.
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