In March, I apparently talked to someone who'd been an extra, and described a scene they were in. 
https://www.narniaweb.com/2005/03/first-hand-centaur-battle-news/

There was still one scene to film: the adult Pevensies.
https://www.narniaweb.com/2005/03/one-scene-still-to-be-filmed/

Meanwhile in early April, Jim Broadbent described his role (Professor) in two sentences:
https://www.narniaweb.com/2005/04/broadbent-comments-on-role/

More clips of pictures were posted:
https://www.narniaweb.com/2005/04/new-narnia-clip-chapter-iii/

A media conference gave some new information, and talked about promotion of the film:
https://www.narniaweb.com/2005/04/narnia-trailer-rundown/

Narniaweb had already posted our own interview with Douglas Gresham:
https://www.narniaweb.com/2005/04/narniaweb-exclusive-interview-with-douglas-gresham/

In May, a number of articles appeared:

Douglas Gresham was interviewed in Working Mom magazine. He describes several aspects of making the film, and also answered questions from the interviewer's children about Prince Caspian - the next film to be made.
https://www.workingmom.com/mentors-wings/narnia.html
https://www.workingmom.com/mentors-wings/narnia-prince-caspian-movie.html

Even more importantly, the BBC announced the date for the release of the film:  9 December 2005. This was good news, as originally it was to have been 26 December.
https://www.bbc.co.uk/films/comingsoon/dec05diary.shtml
Review: https://www.bbc.co.uk/films/2005/11/25/the_chronicles_of_narnia_2005_review.shtml

A number of new books were announced, with Narnia or Middle-Earth connections:
https://www.narniaweb.com/2005/05/new-books-coming-soon/

And the new map of Narnia was released:
https://www.narniaweb.com/2005/05/brand-new-narnia-map-available/

In the next few months there were lots of small Narnia-related news items, but no major items. 
One of the most looked-forward to was the "Music Inspired By Narnia" album, with songs by a number of Christian recording artists.  (I still have a copy, and some favourite tracks - have you got it?) 

https://www.narniaweb.com/2005/08/sound-clips-from-inspired-by-soundtrack/

It was announced that the premiere in London would be a royal film performance! 
https://www.narniaweb.com/2005/09/lww-premiere-selected-as-royal-film-performance/
https://www.dailymail.co.uk/columnists/article-361082/Tilda-leaves-spellbound.html

Oh dear, I've got rather behind with this! 

I'm catch up on my next day off...because 20 years ago the film was released!