Considering 3-4 years ago he referred to him as a traitor, I'd say the significant shift in stance is news. Should a pardon happen, this would set an important precedent for future whistleblowers and for the rule of law in the often obfuscated corners of the federal government.

Support the efforts of Rand Paul and Thomas Massie, who have already publicly stated their support for a Presidential pardon in this case.

Seven years ago, Trump said Snowden should be executed.

Four years ago, in an interview, Obama refused to pardon Snowden.

I’d say this is a notable development.