I´ll keep calm till the dead line. Spent so many years thinking about what to buy that I don´t want to make this buy a stressful act. 
My biggest desire is the amps arrive with no malfunction at all. I´ll be mad if I´ll have to return them right away, but I´m convinced it´s going to be everything alright. 
Don't worry about it. The 4B is a fabulous amp and you should be excited. Two weeks after expected delivery is nothing to. I am pro dealer and if the dealer can use another two weeks thats nothing to worry about. I want these guys to stay in business. But again it's all about what they tell you and it taking 3 months.
Btw don't get to excited if your amp doesn't turn on right away. When I bought my 4B I couldnt get it running. I had to sit through supper griping about my amp.
As it turns out you have to get used to the first time you engage the power button and the turn on button in the back. If you don't turn it on in the right order it won't fire up. Just giving you heads up. Its not broken but something to look out for.