Honestly, you must remember...they could be waiting for a time to launch it..I believe and don't quote me on this but I think that they will have the NGS by the end of the year..Because it has been every three years that major updates come out..which was said by Helios.
On the other hand, I personally think it could happen this year, but probably unlikely since there are more important things than the NGS..and since the NGS is behind it is a less of a concern to worry about at the moment.