It doesn't seem to be working for me. I am running a multisite install atm wordpress 4.4. When i try to visit the check for updates page in wordpress it does not trigger. When i moved the code into the construct it did trigger - but then it will trigger on every page including the frontend which is bad i guess.
As for the bundle fix, sometimes we don't upload all the plugins in a bundle for a specific site - so the new update system will need to support that.
