I thought it said taping would begin April 4??? Makes no mind. From what I read, presently Abby will be seen until May. If a recast starts filming in April, and won't be appearing til several months later, (remember Days will not be shown for 2 weeks in August) then it would seem that the character of Abby will not be on screen for 2-3 months at least. I would say the decision to recast was delayed quite a bit, as they have known for a long time that Kate Mansi was leaving.
So.....unless the recast tapes scenes to be inserted here and there during the summer, Abby will not be around, and we won't know why.