Based on last years trials, determination of results and...

Based on last years trials, determination of results and reporting methods - April or May 2011 shape as likely.

Very strict protocols have to be achieved with these medical trials, etc.

However if there is a suitor on the ground monitoring events in Africa, some form of positive announcement may come at the conclusion of the trials.

Followed by a trials result report once the very strict protocols have been met to enable the release of a report.
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NB: These are my thoughts, in the first part based on my lessons learnt from this stocks track record during 2009 and positive faith.