There have been a few developments on this situation, since the original press release by prracewire.
Both parties in dispute have released a statement.
You can read Markus Niemela's statement here.
You can read Brooks Associates statement here.
The original story is available here.
My take, this is a truly unfortunate situation that likely should have been handled "behind the scenes". It's disappointing to see a talented driver and team throw away a relationship that produced a championship.