That's the next speculation, will she or won't she be back in action. Will she be OK. Does she look good. Is there any sign of the surgery. You can imagine what the speculation will be. I actually feel sorry for her as without a doubt the scrutiny of her will be awful.
I think Kate has had enough and I also believe it was a serious bowel-related physical illness (not a tummy tuck, hysterectomy, mental breakdown or anorexia). If it was autoimmune in nature, she may be on medication that changes her appearance which explains why she's hasn't been seen in public at all. If she doesn't look exactly the same as before in her first appearance after Easter, then all hell will break loose. Maybe the original strategy was to give her this time to recuperate and then possibly announce the condition along with her first appearance.
There could have been complications, MH issues, delayed recovery or just the general realisation that whatever she gets out of the marriage and being Queen is simply not worth it. She knows the world's press is waiting with bated breath to see her reappear after Easter looking as majestic as ever and the pressure is unbearable. Or maybe it's the realisation that she truly enjoyed spending these few weeks, the longest ever since she got together with William, out of the public eye with her children. If she leaves the RF, then she can have that life all the time. She'll be like Fergie...sometimes in the press but obviously not their main target anymore.