Assuming your US employer is OK with the move, look to your own knowledge of your second country.
How fast, reliable, costly is internet service? Can you get a second reliable service so you have 2 independent links? A second link that still uses the same local/monopoly provider to deliver is not a second link at all. You need to have communications as reliable as possible.
Do you have reliable power? Power reliability affects every country - no matter where you are going, get a minimum of some UPS power coverage and ideally some sort of generator backup. In the UK I had to run for 7 straight days off generator after a storm and my location was one of the very last to get brought back on grid.
Make sure you have a good money transfer provider to get funds to a local bank account, but watch out as many banks will refuse to touch you if you are a US citizen (search past HN for stories of that). Frankly, this could be your biggest problem.
Enjoy the move - it can be surprisingly pleasant to be in a different country. If you start earlier than the US, you can get a lot done before people come online and you will appear to be a miracle worker fixing problems while everyone else is asleep. Conversely, try to avoid coming online /after/ the US as you could appear like a slacker !
