You appear to misunderstand how Apache works. Let me clear up some of the confusion.
First, the Apache ICLA is not a copyright assignment like the old Sun CLA was. The "C" stands for Contributor, not Copyright, and if you read the document you see that it says nothing at all about copyright assignment:
Second, the Apache ICLA is not required in order to contribute code to an Apache project. Yes, it must be contributed under the Apache license, but there is more than one way to do this. Apache projects regularly accept patches from contributors on the mailing list or via Bugzilla, without an ICLA.
Third, the Apache OpenOffice already has active members of LibreOffice. Several have even been elected as Committers in the project. So if I or anyone else wanted to make a big deal of this, we would have done so already.
4th, only individuals can join an Apache project, not corporations or foundations. So it does not make sense to talk of LO/TDF joining Apache. But as mentioned above, there are already individuals who are happy to contribute to both projects.
5th, The recent increase in Chinese developers on the list is not from IBM, but from another company, Chinese Standard Software Corporation, in Beijing. These are the engineers from the former RedFlag/RedOffice, who have a lot of experience with this code base. So it is great to see them join.
6th, The IBM contribution of Symphony is ready to go once Apache OpenOffice 3.4 is released. We're talking a week or two at this point.