I dont think so. Blizzard changed its stance from looking into this, to no ETA, to we don't support it. I think Wineskin or Bootcamp will be the only options left. Blizzard doesnt provide any patches anymore and you wouldnt be able to install them on Yosemite anyway.
What KALLT said is sadly true. loos like the options are
* run an older Mac with Mac OS X 10.6 or below
* run a VM With Windows (you could try a VM with OSX 10.6, but graphics drivers and audio drivers are basically rubbish or non existent in VNWare Fusion/Workstation, I haven't tried in Parallels or VirtualBox)
* run the game through WineSkin. [what I ended up doing]
* Bootcamp with Windows
I keep holing out the Blizzard will release a real Warcraft IV, but it seems like if it's not related to WOW then Blizzard is slow as tar to do anything.