Alex where do you think the rumors come from?  Why capital gains and why now over the numerous other options out there.  

Obviously the government can't officially say what they intend to do ahead of doing it.  There would be little point in delaying the action as the effect as it would create even more uncertainty than the current rumors.

Most of these rumors are simply trial balloons - to get a sense if the effect is catastrophic - i.e. non-confidence motion or favored by the general electorate.  Or if it is somewhere in the middle, how far they can go with it.