"IBM apparently ... will introduce the software as AIX Version 6.1"
I understand that some marketing droid committee in IBM corporate has decided that customers are too easily spooked by ".0" releases, so in order to avoid that ... there won't be any in future. Us customers are so easily fooled that we won't realise it's a major new release, we'll be lulled into a false sense of security by the fact that it's ".1", not the dreaded ".0".
I first heard this from a product manager who told us that the next version of the product we use would be "11.1", when the current version was "10.2". When I asked 'what happened to "11.0"?', they told the audience that 'this was a marketing decision'