One interesting thing in the mailer from Spartan Fund - the original Munn renovation plan seems to have been resurrected.
The rendering on the mailer shows that Breslin is west of the expansion. That means this new construction would be on the Munn Field/south side of the arena, which is opposite of the current locker room location. That lines up with the plan to "flip" the building. In that plan, the home locker room and bench would also move to the south side of the building. That would also mean the penalty box is moving along with it, and the visiting/assignable locker rooms would all be relocated to the north side. That also would mean a change to the club seat/suite level layout - the existing press box would be cleared to allow for the club to be expanded (since this is a much more popular option than buying a suite), and the center four suites on the north side would be repurposed as the new press area. That also would require the re-cabling of most of the arena and a new camera platform on the north side as well.
There were a few prior proposals for locker room renovation before, but they always hit a roadblock thanks to the massive amounts of concrete underneath the arena that made it cost prohibitive and structurally unsound to complete the work in those areas. That, along with the desire to "show off" the new areas made it more feasible to put expansions on ground level above where the locker room proper would be. And with the pine stand on the north, it was much easier to expand on the Munn Field side.