With Arduino.SE entering public beta, I think it's an appropriate time to talk about general migration policy, and a few general comments.
Questions should not be closed just because they have an Arduino.
There is a wide range of quality and content in our Arduino question pool. They range from
send me teh codez to good examples of electrical engineering principals. Bad Arduino questions rarely are bad just because they use an Arduino, so this should never be a close reason. If you have a Pavlovian response to close a question the moment you read
Arduino, consider adding arduino to your ignored tags. StackExchange sites are allowed to overlap in scope, and there may be considerable amounts of overlap in this case - and that's fine.
Questions will not be migrated to the Arduino.SE beta site.
Starting a site is hard. The Arduino StackExchange site has had a lot of additional difficulty because they need to distinguish their site from Electronics.SE. By effectively dumping our unwanted questions on them, they would be getting the dregs of a site much larger than their own before they have a chance to build the community and get a sense of what Arduino.SE is about. Arduino.SE was not founded to be Electronics.SE's dumping ground.
There is a general policy to not migrate questions to beta sites. Questions aren't migrated in general because the question must be a good question and off-topic for our site and on-topic for the target site. This answer has a lot of good guidelines and information about migration. If you are wondering why questions don't get migrated when you flag a mod to migrate them, read it!
The last reason for not migrating to Arduino.SE is that there are no (pro-tempore) mods yet. That means if a migration was incorrect, it will be very difficult to close that question. It will be relatively easy for us to create a mess that cannot be easily cleaned up.
Things to consider when migrating questions:
Don't migrate crap! Ever. If the question is likely to be closed on the destination site anyway, don't bother migrating it. Just close it here and advise the OP of the other site in the comments. If they decide to improve the question, then they can go post it over there, or they can edit their question and have it migrated later.
Avoid migrating answered questions. The point of migration is to send the question to an on-topic place when it can get answered. If the OP already has an answer, then we've already defeated the purpose of migration and the destination site won't have anything to do with the question. Avoid migrating these questions unless they are of extremely good quality and risk deletion on the current site.
Don't migrate for the sake of migration. We only migrate questions because they are off-topic on this site. It is perfectly possible for a question to be on-topic on multiple sites, but that is not a reason to migrate it elsewhere. The OP asked their question here, so if it's on-topic here, then it should stay here.
Be familiar with the destination site. If you have never even visited the destination site before, read through the FAQ thoroughly and make sure the question actually belongs there. Don't look at the name of a site and automatically assume the question can be asked there. Each site has their own rules which vary greatly across the sites.
If you're not sure, don't migrate it. Let someone else who is sure do that, or ask for opinions from the community in a relevant chat room.