Extract from It's SHOWTIME web site :

The reasons why this title has become vacant:

1. The defending champion has to defend his title within 1 year. This term of 1 year can be extended with another year by IT’S SHOWTIME. However, this term of 2 years has expired. Tyrone was supposed to defend his title in May 2010 in the Amsterdam ArenA against Melvin Manhoef, but this fight was cancelled due to an injury of Tyrone Spong.

2. The management of Tyrone Spong has also announced that Tyrone will not fight under 95 kilograms anymore.

 

More on this as it unfolds