ISS missions are top priority as we try to follow the poll results (with an occasional surprise here and there).
Regarding which ISS mission, that remains to be seen. Our aim is to cover as many interesting ISS missions as possible until the next version and then keep going with more and more missions so eventually STS-98 will be completed too at some point.
We cannot commit to a specific mission release schedule, but we're doing our best to make as many people happy as possible.
/Admin