The upgrade takes effect from August 31. Telkom internet will do their uncapped guys by the 31st. Capped to be announced at a later date but one will assume post the 31 August so within 2 months. This is obviously on Telkom Internet. It is however a general speed increase 2m to 4m, 4m to 8m, 8m to 12m etc. If you rent an ADSL line from Telkom you get the free increase. Not sure what happens if your line is controlled by your ISP but I assume they will have to pass it on. The free speed increase will be rolled out country wide. Ironically this is the first time the free-upgrades have been shrouded in such mystery. I literally had to ask the same question 20 different ways before I got a complete answer from Telkom staff on their facebook page. The kept indicating it is linked to their uncapped bundle service. "When general line upgrades are done, they are for every customer regardless of isp. ^Frank" was the final word. Even the Techcentral article implies it is Telkom only deal.
Telkom Facebook changed their mind again apparently the free line speed upgrades are only for Telkom Internet users. However unless they subsidize the cost even if it is only a journal entry they cannot charge me more for the same line speed than they charge their own customers.