I'll be converting to Android this year. I installed Kit Kat on an S4 (don't like Touch Wiz or other interfaces) and really enjoyed using stock Android while setting it up as a phone like it was my own.
This past week I have been evaluating a Nexus 5 and have used it totally in place of my iPhone. So I have two Android phones right now, ha ha.
It's been a success as I discovered the last piece of the required apps, LockerPro for excellent notifications, ios style.
I tried an S2 with ICS a while back and didn't like it so stuck with Apple. Now I am digging what Android can do and no longer see the value in what Apple charge for the iPhone.
I like the Nexus but battery life seems better on the S4 and I much prefer the menu, back and home buttons at the bottom of the screen.
I also discovered I can't use the Nexus outside in landscape with my polarised sunglasses on as the screen disappears.
Add removable storage and Samsung wins, the hardware race.
I'll only be interested in a GPE version though so I'll keenly watch the announcement and see what happens with a GP edition.