Here's the deal. The first session on Saturday "may" be live. There's a lot of talk about whether or not it will be. I've always heard the meetings took place on Friday, but maybe this year is an exception. The next three sessions cannot be live and have not been advertised as such.
Bobcat is right about the box. http://www.aminocom.com/ That's the link for the box that I've seen our elders talk about. It has no download functionality, only streaming, on the models being sent to the KHs. Someone on here posted a link earlier to a streaming site on jw.org. It may connect to that, but who knows. The boxes that have been sent out are hard wired. Most congregations are running ethernet cable in preparation of this. Some of the less savy ones are running the cables along the floor and covering it with duct tape. Since it is hard-wired and bandwidth doesn't need to be compromised, wireless is being turned off to prevent cell phones, tablets, etc from stealing internet bandwidth and causing problems for the stream. There's going to be a lot of people at these things. Having a hundred extra devices on a home office grade networking equipment would be detrimental to the quality of service.
The big surprise everyone is looking forward to? It's a Bible. You'll have to wait two hours into the program. It'll be announced after song 75, then elders will bum rush everyone to get them out within 5 minutes. Supposedly they will be wrapped in plastic. If you really want to get on their nerves, take the plastic wrapping off before they tell you to.
Sorry to spoil the fun, but the above is fact, as I have no reason to believe the elder would just make this up.. One of our elders accidentally slipped in casual conversation. It was really easy to put the rest of the pieces together after that. His lips were mum after that. I couldn't get him to tell me any more such as what's changed in the bible, such as new version? new name? simplified/children's edition?