Clearly (and not unreasonably) Turnbull is an ambitious man, and one suspects that he believes that Rudd is in danger of losing the next election. This seemed unthinkable 6 months, 12 months or 2 years ago...but does now seem a possibility.
One guesses that Malcolm is attracted to being part of the next liberal government!
So Kevin might be feeling a little edgy.
However, I guess he could also be reassured when he looks at Turnbull's record at testing the political wind. Which is not particularly good!
In fact Rudd may well be rubbing his hands with glee at the destabilisation that this is going to bring to Abbot's Liberal Party.