Default Multi-window possible?

Hey just wondering if multiwindow is possible on our m8 ? if not is there any developer working on it?

Current Devices
Tmobile Sony Z1s
Verizon Htc One M8 (2x) (1 Sold/ Traded in) (1 Kept)
Verizon Lg G Pad 8.3
Verizon Moto G
Ipad Mini Verizon
Microsoft Surface Pro

Previous Devices :
LG G2
Droid Maxx
Htc One M7
Htc One Max
Droid Ultra(2 days lol)
Samsung S4
Many others... too many to list