It won't happen. I'm pretty sure I remember twicker objecting to such stuff as it can be very easily abused. Many forum members agree. (I'm one of them.)
I hope twicker doesn't choose to implement image support on the forum. The lounge can be bad enough as it is now, just imagine it with photos enabled...
Anyways as Duoas pointed out most members rejected the idea to have avatars on this forum so I doubt many would like to have imaging support enabled in posts.
Just use imgur, it's free and you can easily paste or upload images and give direct links to them. I see no reason to add image/file upload support to this forum.