All the defence hysteria about a "fair trial" would suggest that he is likely to plead "Not Guilty". Which, as has been discussed before, would be lawyers doing their thing.
If he has confessed - which presumably he must have done in order to lead the detectives to her body - then the question of pleading "Not Guilty" surely could only arise as to the manner in which poor Jill died. In other words - maybe a claim that the death itself was unintended, accidental, or whatever.
However, trying to suppress or shut down social media will be like trying to put the lid on a pile of eels - with no box! It ain't gonna happen! And the more they try to shut down discussion on social media, the more it will be discussed.
I'm not referring here to sites like WS which are very well moderated - I'm referring to the "open" media like Twitter, Facebook, numerous blogs on self-hosted servers, etc etc.
But as has just been pointed out above - this could be simply the groundwork by the defence.... make all the right noises now, and then claim that there is no way that the accused can get a fair trial. As Ausgirl said:
What's the bet this will be a technicality angle used to benefit the suspect and his defense? I think we're looking at the prep work right there.
Of course, if he pleads "Guilty" then there would be no trial anyway, so....