The Horniman Museum looks set to re-landscape the animal enclosure to include a path through its middle. They're calling for students to submit designs:
New forum members might be interested to know that they are also asking for more general ideas on redeveloping the gardens - see the following page on their website and the a thread from the old se23.com forum:
And although there doesn't seem to be any info on the website, their latest 'what's on' pamphlet says they're also planning on raising funds for a revamp to the natural history (stuffed animals) section. Sounds good but I hope they keep the walrus.