I'm a bit confused here ... hoping you guys can help. Last week I was in a situation where I needed to buy an Airport Extreme asap. I always buy directly from Apple but didn't have time so bought from my nearest bricks and mortar store. The serial number of the Extreme I bought is MC340B/A, and the model no. is A1354. Is this the most up to date model? Also, when is the next version of the Airport Extreme expected?