I was wondering how it is possible that Mylyn does not offer filtering incoming changes. But quick look into Mylyn user guide revealed, that it is possible, but you need to switch to 'Scheduled' mode:
And then all dates will be visible - and some scheduling categories appear - and 'Incoming' tasks. That's what I was looking for:
I do not think this is a good idea to have such an important functionality so hidden - I have filled bug 378334: Make focusing on incoming tasks easier.