From what I can see on the council and DPEA sites for the larger part of the West Craigs site:
On the council site there is correspondence from the end of July when the developers wrote to the council requesting that the deadline be extended by 2 months (8th October rather than 8th August). The council agreed this although no reason appears in the letter.
The DPEA meanwhile has extended their deadline to the 21st of September. At the glance the correspondence on their site seems to point mainly to disagreements around education as the reason.
For the small Taylor Wimpey plot adjacent to Maybury Road. The council planning site suggest that the Planning in principal application is "Minded to grant". They will then need to apply for detailed planning permission.