I have a feeling it will happen suddenly before the announcement. Some people will know when its about to happen and they will start buying with higher volume to accumulate as much as they can without makng much noise. Then suddenly it skyrockets. there will be some profit taking but the buying will continue taking it higher for 3 to 5 days. The people who take profit early will buy again at hgher prices. It could start happining today or tomorrow. Have a good trading.