Seattle arena proposal

Lindsay Lowe / KPLU

The revelation of big local backers. A huge fan rally. A high-profile meeting with the commissioner of the NBA. It all happened this week as supporters of the Seattle arena proposal get ready for key city and county committee hearings next week.

The opposition is heating up as well.

Elaine Thompson / AP Photo

A planned rally for Sonics fans at 4 p.m. today in Occidental Park is perhaps taking on even more significance, with word this week that Microsoft CEO Steve Ballmer and two members of the Nordstrom family are among the investors behind the plan to bring the Sonics back to Seattle with a proposed new arena.