There is no news to report on this feature nor the estimated release date of 2.03.
As such I would recommend not waiting for it and implement using a different method.
You will need to split your 14 channel AIFF into multiple files to get under the current 12 channel limit.
Place each file on a separate track and use a channel mix effect configured to stereo to control your ambience.
Using this method you can scale up to any number of channels you need.