Some comments. I am unable to make this week's call, but here is my feedback on these items.
 

1) Name of property dfdl:textNumberRepresentation is not consistent with dfdl:binaryNumberRep, dfdl:binaryFloatRep, etc.

I vote for "Rep" not "Representation" uniformly. It's just too long a word makes all the example word-wrap badly, the property tables all look yucky, etc.
 

2) The dfdl:numberPattern etc properties that have been moved from the defunct dfdl:textNumberFormat annotation to dfdl:element etc should be called dfdl:textNumberPattern etc. Otherwise users will think they apply to binary numbers too.

Agreed. 

3) In section 14.3 on sequences, there are several sub-sections that talk about parsing according to different ways of specifying length (ie, lengthKind). But dfdl:sequence no longer carries dfdl:lengthKind so I think these sub-sections are not in the right place.  I think they should be in section 12, under the correct 12.3.x lengthKind sub-section.

I had the action to revisit sequences w.r.t. the grammar stuff. I moved these sections you mention around in a revision I sent to Alan yesterday. I put them up into the general length discussion.
 
...mikeb