Answer from IBM

Douglas Heintzman, Director of Strategy has answered my questions here

We do plan to incorporate the most recent code form open office as soon as we can into Symphony. The question of which features, such as otx files, get in and get in first is a mater of prioritization. Much of this prioritization is being driven by user feedback.

Hmm... And what does that mean ?
I guess that IBM actually don't know where and when. I'm sure that IBM will do a great contribution to the community and from this answer I can read that IBM plans to keep up with the code line in OpenOffice.org. But when this will happen is unfortunately still unclear. It could be great if we could tell existing Lotus Notes users, that they don't have to go to open standards because open standards will come to them.