The 3.4 What's New document has a section entitled "New expected features for Python implementations", a title not found in previous releases.  I believe that the intention is to document features expected to be implemented by all Python implementations, including non CPython ones, when they claim to support 3.4.  However, I think the wording is likely to be misunderstood by most readers as meaning "features expected to be in the 3.4 release (including CPython)", leaving a question in their minds as to whether all of the described features are actually in the 3.4 release.  On the other hand, AFAIK, the standard documentation set has never attempted to document all of the deviations from CPython for each particular non-CPython implementation; if the wording is understood as intended, it could be construed as implying something that isn't true.  So, under either reading, the wording can be misleading.  I think it should just be removed or reworded as "New Features".

http://docs.python.org/3.4/whatsnew/3.4.html#summary-release-highlights
http://docs.python.org/3.4/whatsnew/3.4.html#new-expected-features-for-python-implementations

The idea was to add a category for core interpreter behavioural changes
that aren't language or standard library changes. Inspiration just failed
me completely when coming up with a title for it, hence the current
monstrosity.

Something generic like "Changes to interpreter behaviour" might work.

How about "Interpreter Improvements"?  The marshall format change isn't exactly a behavior change, but other implementations will need to be able to cope with it.  Or should that be moved to Library changes?

I think "New Features" works better.

Rereading that section (it has currently been adjusted to say "New Features"), I suggest:

- consistently using sentence case for those list headings
- tweaking that particular heading to say "Other new features:" (to contrast with the "New syntax features:" heading just above)
- losing the scare quotes from 'pip should always be "available"' (being a distro package install away counts as available in my book)

RDM's checkin ( 21ecc3d52806 ) renamed the subheading of "Summary -- Release Highlights" from "New Expected Features for Python Implementations" to "New features".  But there's still a major heading with that title.  Surely we want to rename that one too?

I propose to check this in.

LGTM

New changeset 3488a9fbe09e by Larry Hastings in branch 'default':
Issue #20931: Fix other confusingly-worded heading.
http://hg.python.org/cpython/rev/3488a9fbe09e

New changeset 7e78e602ec73 by R David Murray in branch 'default':
whatsnew: Fix Features section title, use title/sentence case consistently.
http://hg.python.org/cpython/rev/7e78e602ec73