It's bull****
she only said that after she said the thing about being in the studio with Professor Green to try and backtrack; so many other people have been tweeting about working with them (e.g. people congratulating Felix Howard, their manager) and him being with Reggie Yates who tweeted about hearing three voices he hadn't heard together in a long time on a new record, and he was with Felix and tagged him in the tweet etc etc... basically they're not making an official announcement and presumably have gotten the press to do likewise until things are more concrete. It doesn't make any sense to announce it now when they have no material forthcoming just yet - they could make so much money out of selling their story to an interview with someone or even a documentary, they're not just going to admit it over Twitter. But they've been leaving subtle hints all over the place. It's happening.