There's a major chance the next full build of Android will be dubbed "Key Lime Pie" as originally rumored. This unofficial confirmation officially arrives by way of a Google employee on Google+ who took the time to draw the evolution of Android in a cartoon format, similar to the "monkey to man" depiction used to visually demonstrate the evolution of man.
According to the cartoon history, a primitive, hunchback android started off chomping on a cupcake (v1.5), then progressed to a donut (v1.6) , an eclair (v2.0 to v2.1), a cup of frozen yogurt or "froyo" (v2.2), a gingerbread cookie (v2.3 to v2.3.7) and then a piece of honeycomb (v3.1 to v3.2). All the while, the droid is beginning to stand erect, grow in size, and sprout loner antennae.
By the time "The Bugdroid" was fully erect, he is eating an ice cream sandwich (v4.0.3 to v4.0.4) – or rather, the timepoint in the mobile platform's evolution where Google began to seriously tackle fragmentation. Like the popular depiction of man's evolution, the droid has reached a point where he's visually more superior than the previous cupcake-eating hunchback. The Google employee seems to think this is when Android became a solid platform.
After eating an ice cream sandwich, our popular green droid is smiling and eating a cup of tasty jelly beans (4.1 to v4.2). His next meal is depicted as a slice of key lime pie. He's smiling, fully alert, and seems to have a special green sparkle to his outer shell and a kick in his step.
The version number is unknown at this point, but the next logical step seems to be v4.3 or v5.0. It will likely depend on how big of a leap the next update will make. The jump from v2.3 "Gingerbread" to v3.0 "Honeycomb" was an obvious one as was the leap from v3.0 "Honeycomb" to v4.0 "Ice Cream Sandwich". Recent rumors have pointed to an entirely new build, v5.0 "Key Lime Pie", so we'll just have to see what 2013 holds for Google's popular robotic platform.
Lemon meringue pie?
Would be a logical upgrade from key lime pie as an incremental .x update.