Network Approval
It's obvious that it is in Vodacom's interest to release as many phones as possible. The more choices customers have, the easier they'll buy phones and the more they will call.
So logically, Vodacom will want to release a new phone such as the 6260 as quickly as possible. However the phones must pass a set of stringent tests otherwise you guys, as end users, will complain about poor quality, perceived coverage issues, phones hanging up, etc.
Nearly 500 models have been approved up to now, sometimes with concessions (6260, for example), about 150 models have failed and around 50 are currently under test.
Often a phone must first go back for the manufacturer to upgrade the software or fix some other problem discovered during testing.
The 6260 was recently approved with concessions, so now it must get to the retail channel.