In message , at 16:23:16 on Tue, 28
Feb 2017, Neil Williams remarked:

It will work *exactly the same way* as Oyster as far as the passenger
is concerned. Put money on, auto-top-up if desired, spend it by
travelling.

If that's the case then "Oyster will become like Contactless" is
meaningless, if the passenger can't perceive a difference (other than
the slower gate-opening).
--
Roland Perry