The Sun are pretty reliable when it comes to this sort of thing, so I don't think it's a rumour, I think she's definitely been axed or Anette has quit.
I think this will go one of either two ways now. Either SOC really is axing all the 'peripheral' Carter family members, leaving just the big hitters of Mick, Linda and Shirley, or he wants to see a scaled back but still relevant Carter family with Mick, Linda, Shirley, Johnny and Tina. I assume Sylvie will also go soon so I'm not including her.
Axing Babe and Buster makes sense to me: Buster never really worked all that well as a character, and Babe is too difficult to redeem at this point. Lee was the biggest shock but it may genuinely be that his exit is designed to generate big drama for the family and for Whitney and that the door will be left open for him to return, as the statement said (though I think they'll recast him if this happens.)
I'm a bit worried about Ted's instagram at the moment with pictures of him smoking and checking out scantily-clad girls in Vegas: Danny-Boy's twitter also became noticeably more 'crude' after he was axed. It could be nothing but it's something that just struck me. Could this Vegas holiday be a result of finding out he's also not going to have his contract renewed? It's difficult to say.
There is apparently a press event in October and this may give us our first indication of what the plans are for the Carters, though I suspect anything on the Carters will mainly focus on Lee and Whitney's wedding and Linda and Lee's exits so we may not get any specific Johnny mentions.
At this point, as disappointed as I'll be about Johnny leaving, I'm kind of ready for it like I was with Sam leaving and the hints we got a good couple of months before it was announced that it was happening, so I'm not going to get any hopes up about Johnny staying. In fact I'm going to assume he is going until I hear otherwise.