I Hope it does NOT get intergrated into the maya renderglobals.
I'm annoyed that when you launch a maya software render or mental ray because it is "intergrated" into maya you cannot perform any work on your scne as you render, you just have to wait until your render is done to contine working in maya.
Excuse me, but it's just a question of little script which will run your render as a separate process. And - you will need at least dual system to continue work in Maya, since rendering of more or less heavy scene usually takes _all_ CPU resources of your machine. In the case of stand-alone renderer it's not a problem at all - it's just a question of concrete implementation. I've written such a script for mental ray, but never using it.
Ideal rendering solution would be the system which will launch render on park of networked machines, allowing you to see the rendering progress just like it's implemented in prman. But did you got that little renderfarm? And did every other user got it?
So instead of waiting 30 minutes to change my settings I can Imediatly start tweeking my shaders based on how the render looks as it progresses. So I say keep it as an external renderer and apreciate the fact that you can launch a maxwell render, see the render start taking on the look and go into maya and tweek your shaders and scene to make changes, ALSO a HUGE advantage of it being external is I can Render one camera angle, let that render, and go into maya change my camera position and shoot off another render while the first is finishing. So in the time it takes to do one render I've already started off 3 renders of my scene. For me intergrating into the maya globals whould be a huge waste of production time. Maxwell's power comes into play as it is not limited by the intergation into maya globals as mental ray or maya software are.
It's not a question of integration at all. In Maya you can check required cameras in render globals and render them all at once(if render or exporter supports that feature of course). Also you've got IPR both for Maya software renderer and Mental Ray.
So you're making your purchasing decision based on what menu you have to use?
Actually most of the people makes it's decision, relying on these "just menus". In fact, there's not much difference between 3dsmax, or Maya or XSI. It's all in "menus" and it's combinations.
And yes, these menus for sure make some influence on my purshase decision. I don't know a single person who don't take into account these "menus". Usually people called it "user interface"

Systems with good UI are more comfortable to work, and result can be achieved in less time and less headache.
As a little sample - with current menu-based organisation you can't save presets of render settings(at least without issuing some mel commands). And you can with render globals system.