Hans,
This has been on the Governments radar since 2008/9 and the fees have risen steeply for all self-drive tourists in the parks. We did indeed see many NO ENTRY - PRIVATE PROPERTY, (trespasses will be prosecuted). These signs all the more incongruous as they were in the middle of nowhere, but clearly areas are marked a "private concessions" on Maps.
Its not just that, in the north east corner of Chobe, the parks now only allow a certain number of vehicles to drive certain roads... at staggered times (which you have to prebook), all in one direction. The best times being reserved for the tour operators.
It is further evidenced by the block bookings at all camps and parks in Bots, by the same tour operators. Hence they camps are always full... but there is no one actually there!
Oh and not just that... The Chinese, they're taking over the country with tar roads, where there was once bush....another deadly form of Imperialism in Africa has begun, this time from the East.
I wouldn't wait until 2015... may be too late.