We usually will not announce availability or release dates until most things are done with each project, that is, sprues, decals, assembly instruction, and packaging. However, due to the confusion with all the blister packs and resin vehicle releases, we are updating the following status per your request:
M4A1 - still under 3d drawing - not even prototypes are available!
FlaK 36/37 - currently queuing up for mould making.
Panzer IV Ausf D/E - TS2 plastic, awaiting QC report for updates.
SdKfz 222/223 - TS5 plastic, should be final version awaiting signing moulds off for production.
Kübelwagen - currently queuing up for sprue layout.
There are other projects close to Q2/18 release as well.