From my Economic's class in University I would say it is not convenient from a bussiness or monetary point to release or even announce a possible PC port of the Master Chief's Collection , as mentioned above the is a major sales 'trump card' for the Xbox One is Halo MCC, and although the Halo series where supposed to originally come for PC and MAC, Bungie changed that to Xbox due to Bungie uniting with Microsoft, liltle infant obesse fanboys of the Xbox don't see that and then the rage towards 343i starts. I had the Xbox and the Xbox 360 and planning on getting the Xbox One if a special limited edition comes bundled with the Halo MCC. But I don't go fanboy, I also have teh Nintendo consoles and my PC and I think PS and Xbox fans need to learn a lot from Nintendo and PC gamers.
As 343i said the fans just need to keep asking so I wouldn't get my hopes down, if 343i wants to also give PC gamers what they want I would say the best date would be summer 2015 (May-July). At first I thought 343i wanted to monopolize the Halo franchise but after some interviews I think otherwise.
If 343i releases the MC collection to PC I hope that it comes with HEK, unlike H2V, who came with a really retarded HEK with almost all features sealed and outdated graphics. As a Halo Custom Edition modder and mapper for 8 years I would hope this.Our community has more made than Halo Forge united and TF2, Garry's Mod, Minecraft and counter strike combined.