Will Warp bridge these two objects? I've read documentation and StackExchange for two days or more and installed 2.74, but I'm still lost.  I watched one Warp tutorial which appeared to do what I wanted, which is to create a bridge between the two objects, but I couldn't duplicate the result.  I got some modification between the end points, but no fill.
The objects which I'm working with present matching planes, but if one were scaled, that would be my next question.  Also, the "curve" option of warp seems to be what I need, but there should also be some rotation to get a smooth transition between the two objects. 

https://www.dropbox.com/s/x44ua54ac1pvfnm/warp.blend?dl=0

Thanks for any help.

The 90 degree question and bending pipe didn't answer my question.  @cegaton suggested the following as a possible solution.  This may be the answer, but it may also be beyond my life expectancy to implement.  

A problem with Blender&#39;s Bridge Edge Loops system

What a comprehensive user friendly program.

The succinct statement of my problem may be: join two faces whose normals don't with a projection of a user shape.
Can curve, bend or warp do that?  I haven't been able to do that, and, from Allen's post, doubt that they can.
In blender there are two Warps. 

Warp Tool

The Warp tool pulls selected vertices towards the 3d-cursor. thats it.

Warp Modifier

The Warp modifier, doesn't appear to do what you'd like it to. It will warp in a straight line from A to B.



Tube Tool (can ..sortof)

TubeTool comes closer. Here a a description ( https://blender.stackexchange.com/a/28193/47 ) and here the link to the GitHub repository. Feedback welcome.



TubeTool labours under the assumption (currently) that the selected faces are part of one object. At present that means maybe duplicating them, separating selection and then joining them together into one object. The faint blue line emanating from the faces shows their normal, tube tool allows you to flip the perceived normal by providing an option to specify direction (negative or positive).

This will at the very least give you a nice curve between the two faces, from that point you can select a Bevel Object or reduce the amount of subdivisions in the default bevel circle. The upside to attaching a Bevel Object once the curve is created is that you can adjust the geometry of the Bevel Object to match the two faces.

TubeTool isn't very sophisticated yet, but it could be worth checking anyway - and I'm open to suggestions.