Paul Corfield writes:
Yes because TfL are almost certainly deploying new software to all
card reading devices (on rail modes) in preparation for launch of
contactless bank card acceptance and daily capping in 2014.

Does this mean I will no longer need my oyster card when I visit London?

I have a pay wave debit card and a pay as you go Oyster card and visit
London a few times a year.

Phil