Well from what I've been hearing there is a good possibility they could make another season for CE. Since its supposed to be a retelling alot has been leaning on the SEED Trilogy. As it is thou this wouldn't show for awhile as timeslots are quite filled for the next year or so. However they supposedly are gonna end Destiny with there being an opening in the plot that can lead to a continuation of the story of Kira and Athrun. We may still get the answers to the questions. Surprisingly alot of stuff thats not answered in the series is covered via the SEED glossary as well from the official gundam site. Atleast in regards to SEED. Once Destiny comes over we'll probably get more info.