I'm sorry, but i'm 90% sure that it won't ever happen. It was too bad that some who reviewed N900 said so. We got the portrait browser that was said to be coming by Nokia, that's all.
That 10% i left there would be if we can update N900 to run Maemo 6/harmattan that gets released this year.

Rumour is that next major update for N900 is in March/April with Qt 4.6.