Is Roberta Williams involved with this in any way?
I doubt it. The deal probably involves just Telltale and Activision.
Williams (who's been traveling around the world on a yacht ever since retiring) and some other ex-Sierra designers have stated that they have no interest in making adventure games unless the genre becomes mainstream again. Something about wanting the resources and media attention of the best AAA games since their projects always got that back in the day.
That's sad and makes them come off as doing what they do only for money, fans of their work be damned. I guess I'll never see any new work from them since I never see that style of game becoming mainstream. It sucks, because those old Lucas Arts/Sierra/Legend Entertainment graphic adventures are my fave games of all time. I like those even more than RPG's.