Excellent enhancements to the News Article module, the new interface is a real boon. 

Now that there is the addition of a published time - is it not possible to use the users or if anon., portal timezone to display all times in News Articles 'correctly'.

No - I'd like to see the date/time as UTC + the timezone offset for my timezone, so you'd see this post with a time of 13:30 + 9.5 hours (?) and I'd see it as 13:30 + 1hr.  If the user is anonymous, then whatever timezone offset is the default for the portal.

Would this also modify the date/times used in the template tokens - created date/time and  publish start & end dates? 

Hmm, I'm a little confused by the datetime situation at the moment, here is how the code works currently:-

The client user time is calculated based on the offset from the portal time. Your portal time should really be where your server is actually located (the timezone of that server).

I got the code from this post in the forums.

What times do you get displayed for other modules, e.g. active forums if you use it?

What I am wondering now is should I just be storing the UTC time, then doing the conversion, which would make the above post wrong and I would need to do something with the current data stored.

My apologies I hadn't thought this through at all !!

My portal time was set to my local time zone.  I have now reset it to the server time zone and the times display OK for registered users. 
I did have a few problems on the article save but I see that will be resolved in the next release.

The question for anonymous users is still there but that seems to be a general DNN concern looking at the thread you mentioned.  I would suggest that a host timezone setting which related to the server time zone would be most appropriate, each portal could then apply an offset to express it's operating timezone and the default for the unregistered users and for user registration.