The last I heard was that VPUF and VZZZ were the only remaining 747-200s in the fleet. It hasn't been ruled out completely that some of the other a/c may return.
Capacity has been increased on the JNB and HKG routes by changing a/c type from the A343 to the B744. Also, as per the recent press release, there will be an increase in frequencies to Shanghai, Lagos, Las Vegas and Antigua.
Starting from June this year the A343 will be replaced by the A346 which represents a 25% increase in capacity.
Hope this helps.