thanks guys
i look at this chart which i took from Wikipedia and i get a feeling that we might get a minor bump up even thought the current one works well.
http://i47.tinypic.com/mmde1u.jpg
Yes, but recently, there have only been minor antenna improvements. Not a lot has really changed as there really HASN'T been any big changes in consumer network technology. Faster ethernet speeds haven't made it into the consumer market.
You MIGHT see an 802.11ac draft compatible router, though. If you have a good router now, you might hang on for that, but it's anyones guess when that'll be. Of course, you'll need to also upgrade your hardware to support that. If you have a Mac Pro or a desktop PC, a PCI-Express card will take care of that. Otherwise you'll need a dongle (USB 3.0, otherwise you might as well stay on N, you won't be able to realize the speeds of ac over USB 2). So if your computer doesn't support USB 3 OR have a way to install PCI Express cards, then you're kind of stuck on N for now.
In other words, if your computer can be upgraded to ac, and you're willing too, then you might hold out for gigabit wifi Airport. Otherwise, there isn't likely going to be a noteworthy refresh where you're really gonna say 'Oh gee I wish I had waited!". Perhaps a small one, but nothing major.
Also, there are already 802.11ac routers available. However, if they are anything like the early Wireless N routers, I wouldn't hold my breath. Early draft routers tend to be poor.
My wish list, is a Time Capsule is wireless ac, and USB 3.0 and/or FW800! (The latter not likely though as it's slower than USB 3 and being phased out)