Openreach will still use a CBT, just not the usual 4/8/12 port black plastic rectangular box with the fixed angular ports.
Rather they will utilise the 'flexible tail' CBT that has the ports on the end of short leads, as variously linked in the posts above. Also known as the 'squid'.
This enables them to continue to use the regular connectorised drop cables to/from the premises that have the
OptiTap screw in connector on the end. However rather than screwing the connector into the fixed port CBT, the respective drop cable simply screws into the short flexible 'fly-leads' on the squid-style CBT the same way.
Hope that helps to clarify.