Tax return questions

I am currently a USA Permanent Resident. My husband is American and we are moving to the UK in November of this year

1) I will be filing for a sailing permit before I leave, and I will also be filing an I-407 with the UK Embassy in London on my return to officially terminate my residency. We will file our taxes for 2011 as married filing jointly.

This to my understanding should clear me of any requirements to file anything for 2012. If anyone knows different please enlighten me.

2) I have read a lot about the FEIE and the Tax credits and think I have it all reasonably straight in my head until it comes to my potentially owning a business one day.

I am going back to work for my family's business with the expectancy that one day it will pass to me assuming I display the ability to run it. My hope is that my husband will come work with me and eventually we will be running it together (hopefully in a very long time cause Dad better not leave any time soon *grin*)

Still I am trying to work out the ramifications and the best tactic. It strikes me at this point that I should own the business solely in my name and that my husband will simply be an employee. With him married filing separately will that eliminate any and all complications?

3) This is hopefully a really stupid question. I will be bringing our first born into the world next year, if we apply for his American citizenship based on his Father, is that signing him up for the same silliness for the rest of his life or does that only start once you have lived/worked in the USA and then leave the country? It seems silly to not get his American passport (and yes I am aware of the technicalities of him travelling to the USA on a British one if he has a claim to citizenship) but I also don't want him cussing me in 20 years time cause the States got more draconian and decided to change some of the current laws/tax treaties. I guess he can always renounce it himself later if he chooses?

Here's a link for the citizenship issues

http://travel.state.gov/law/citizenship/citizenship_5199.html

If your US husband satisfies the number of years residency (usual if he grew up in the US) then your baby will be a US citizen at birth, you don't have any choice in the matter and he/she will have to deal with US taxes. This will complicate financial life and reduce investment options later in life, but might be useful if he/she ever wants to live in the USA.