Akihiro Gono updated his blog and talked about his condition on April 26.
I woke up at 7:30 AM yesterday and went to see a doctor. As a result of an examination, my hand is 95% cured and I got a permission to do some light weight training and rope-jumping. I suppose my hand is healed 100% next month and will start training normally. I will start weight trainings gradually and come back fully in June. I will train 3 to 4 months and come back to fight in September or October. This is not more than my prediction though. I should be careful until I actually heal.