Not so far fectched.   I am expecting for months that the next xbox could be also the steambox that we have heard about before.  XBLA/steam already saw some exclusives,  half valve gets out,  valve team member working on MS projects like Halo 4, Xbox games popping up on Steam...   Would not be a shock if they announce it..

Too little too late yet again for Halo and the PC. Few people want such an old game, and even less because they have already played it.

That'd probably would be just what Halo 3 needed to kick it back into the top 20 live titles, still astounded it lasted for 4 whole years.

I would really like this to be true. I played A LOT of Halo 3 multiplayer over a friend's house but never beat the single player, so I would definitely get this (not at a full price though).

Cross-platform play with competitive first-person shooters between PC/console doesn't work.

Nobody in their right mind would attempt this.

Shadowrun?

Shadowrun highlighted the disparity between Keyboard & Mouse and Controller.
I would love for there to be a solution to this but I don't see it.
Cross-platform play would work with MMOs, co-operative FPS games (Portal 2) and many other genres. But not competitive FPS,

I don't think Microsoft cares for a 5 year old console game sales on PC. They would much rather have a news headline for cross platform play and give people reasons to switch to Win8/win phone. Much like they did to Halo 2 and Vista.

In the last month there have been 2 Xbox Live games that allow for cross platform play

Skulls of the Shogun - Win 8 Win RT, Win Phone and Xbox

Galactic Reign - Win 8, Win RT, Win Phone

I don't see why Microsoft wouldn't want continue this trend down the road and include other, bigger name titles including Halo.

This is actually Gabe Newells biggest fear and the true reason he's blasting Win8. 

As much as I enjoyed Halo 3, I'm not sure it'd do well on PC if they don't do graphic updates to it, it'd be extremely dated as a 6 year old title from 2007 graphically and might not grab as many people on PC looking like that.

Some of those points are rumors which may or may not materialize, much like this one.

Im just speaking what makes sense for Microsoft and their converging ecosystem strategy. It's all about ecosystems at this point and while standalone MS games are still sold on Steam, those days are slowly coming to an end. It won't happen tomorrow in even in 2-3 years but as Win8 adoption grows, they will move away from supporting any game store other than their own.

The real differentiator for the ecosystem battle is to release titles which span multiple platforms and devices and Microsoft can't do cross platform support on Steam, like they did for the 2 xbox live titles listed above.