I think now that Deere has had the 900 series out for a couple years, you will start to see updates on the series. A few months ago I had briefly asked my dealer if he knew if Deere would be coming out with any EFI/DFI engines or any liquid cooled engines. He said he hadn't heard anything about new engines yet.
I find it interesting that Deere is only offering the EFI enigine on one model and not multiple. I bet that they are going to see how well that model sells and then decide to move forward completely with offering EFI engines along with the standard engines or if they will drop that idea entirely.
It'll be interesting to see what, if any, other EFI engines are offered later.
'07 Chevy 2500HD
2010 John Deere Z925A 54" MOD
2011 John Deere Quik Trak 647A
John Deere walkbehind