No, it's not OBVIOUS. But it's clear that she is giving it serious consideration -- which is quite a different thing.
The 'One Nation' tour of the Mid-Atlantic and New England was an effort to ascertain the depth and breadth of her support.
The upcoming visit to the UK is an attempt to understand the unique requirements of leadership (Thatcher) and the unique diplomatic relationships involved (Cameron).
It's evident that Palin is giving serious consideration to running -- more consideration, perhaps, than any candidate for President has given in the past hundred years. But, no, as of now, she's not running.
Yet.