As posted by Steve Mutly on the 'Stagecoach Enthusiasts' Facebook Group, these are the vehicles (besides the 'Pronto' E400s) due for delivery in the coming weeks:

ADL MMC/ 48v Smart Hybrid (Barking ; Route 169)
11001 SN18KVB
11002 SN18KVC
11003 SN18KVD
11004 SN18KVE
11005 SN18KVF
11006 SN18KVG
11007 SN18KVH
11008 SN18KVJ
11009 SN18KVK
11010 SN18KVL
11011 SN18KVM
11012 SN18KVO
11013 SN18KVP
11014 SN18KVR
11015 SN18KVS
11016 SN18KVT

Volvo B5LH/Wright (Cambridge)
13808 BV18YBA
13809 BV18YBB
13810 BV18YBC
13811 BV18YBD
13812 BV18YBE
13813 BV18YBF

Volvo B11R/Plaxton Panorama Double Deck (Ayr)
50401 YX18 KLK
50402 YX18 KLL
50403 YX18 KLM
50404 YX18 KLN
50405 YX18 KLO

And now to explain the previously mentioned fleet numbering:
As you can see, the 'Pronto' E400MMCs finish at 10981. The 10xxx series will be finished before this year's order of E400MMCs is completed. However, it has been decided to number the 'Smart Hybrid' examples for London in the 110xx series rather than carrying on with the 12xxx series. As such, this means that once the 10xxx series is full, standard E400MMCs will be numbered 111xx onwards.