Leica, Novoflex, Fotodiox and some other brands also have these adapters without electrical contacts..........What most of us need are those similar to Novoflex's EOS-SL or Nikon-SL with autofocus at half or cheaper than the Novoflex ones.
Leica will definitely benefit from the alliance. Currently, most people are put off by the astronomical prices of Leica glass. If they can get a used T or SL and pair it with Panny or Sigma glass, it would open up more Leica users to the world.