> What is the specific regression from 3.2 that this deals with?

I don't know if it must be called a regression, but at least the behaviour is different in Python 3.2 and 3.3. For example, an Unicode array is no more equal to its memoryview:

Python 3.3.0b1 (default:aaa68dce117e, Aug  9 2012, 22:45:00)                                                                                                   
[GCC 4.6.3 20120306 (Red Hat 4.6.3-2)] on linux                                                                                                                
Type "help", "copyright", "credits" or "license" for more information.                                                                                         
>>> import array                                                                                                                                               
>>> a=array.array('u', 'abc')
>>> v=memoryview(a)                                                                                                                                            
>>> a == v                                                                                                                                                     
False                                                                                                                                                          

ned$ python3
Python 3.2.3 (default, Jun  8 2012, 05:40:07)                                                                                                                  
[GCC 4.6.3 20120306 (Red Hat 4.6.3-2)] on linux2                                                                                                               
Type "help", "copyright", "credits" or "license" for more information.                                                                                         
>>> import array                                                                                                                                               
>>> a=array.array('u', 'abc')
>>> v=memoryview(a)                                                                                                                                            
>>> a == v                                                                                                                                                     
True