Having checked further, it seems highly unlikely that there will be any announcement of the result of the investigation. The JCQ regulations which govern malpractice investigations are clear that the work of the Malpractice Committee and their decisions are confidential, although in the case of serious malpractice they may share information with appropriate professional bodies such as GTC. So I suspect you will never know the outcome of the investigations.
It is, of course, the case that every school loses some teaching staff in the summer. Teachers tend to leave school at the end of term or between terms, with the end of the summer term being a popular choice. If a significant number of teachers left unexpectedly that could indicate a problem but when there are accusations flying around it is easy to interpret normal staff turnover as suspicious.
I note that one of the posters refers to "six whistleblowing teachers". I have seen nothing to indicate that the whistleblowers were teachers. Indeed, as some of the reported allegations appear to show the school following the rules correctly, I would be surprised if the whistleblowers were teachers. Of course, it could be that the reports in the press are wrong and the allegations actually made were all genuine breaches of the rules.
I would note, by the way, that neither the school nor the exam boards were the source of the stories in the local press. Most investigations into alleged irregularities receive no publicity at all. I therefore suspect that the information in the press came from the whistleblowers, which makes me wonder if they really have the best interests of the school and its pupils at heart.
To give some context, last year 106 penalties were issued to exam centres and 79 to individual members of staff for irregularities. I cannot find any statistics for the number of centres/staff investigated.