Recent news appears to be they are changing that again at some point, after new deal or midway through, not sure. Bt have a 3 year deal but Uefa think the viewing figures are woeful so want to go back to how it was before. The question is is BT going to make their 900mil back for the 3 year deal.
Uefa won't be able to break it but if BT viewing figures aren't high enough they might be more than willing to make some cash back but letting say 1/3 or 1/2 the games be shown on terrestrial tv from next year. C4 are getting into sports with their F1 deal and afaik they have new funding and might be willing, BBC or ITV would both probably be interested in a cut price deal from BT looking to make some cash back.