When Time Capsule is going to upgrade?

We are all fellow users and not Apple employees so do not have any inside information on Apple's upgrade plans.

Give Apple feedback at http://www.apple.com/feedback

You have posted your question on a user-to-user support forum. We are all users here, just like you.

Unfortunately, no one on a user-to-user support forum will be able to provide any information about what a notoriously secretive company like Apple might do, or when they might do it.

When...and if.....Apple makes an official announcement, then we will all know.

Meanwhile, no one knows except Apple, and they will never tell.