The licenses were due to expire on 31st December 2015 and now they will be made indefinite.
The licensees can use the bands for equipment that complies with Interface Requirement 2048 (IR 2048) in-line with other licensees.
From January 2016, there will be new pricing set which incentivises the licenses to utilise the spectrum. Pricing has not be set yet.
28GHz allows high bandwidth point-to-point links which can be used for backhaul and with Vodafone's purchase of C&W it makes sense to use their own spectrum for mobile backhaul.