This week I just came a cross this interesting article on land grabbing. It is one of the first that also mentions that some of the projects are failing, mainly due to soil fertility. See http://www.bbc.co.uk/news/world-africa-16590416
I also heart some rumors that one land grabber, in Gambella region in Ethiopia, is thinking of handing back his land to the government, mainly because it is too difficult to get things organised. It is especially difficult to get labor force that can work on farm, in zone where local people are used to pastoralistic life styles.
Nonetheless the land grabbing goes on in Gambella region, as suggested by this article : http://www.bbc.co.uk/news/world-africa-17099348
Interesting story to follow...