Google leaves Key Lime Pie Easter eggs at I/O20
The teases weren't anything big, and we certainly didn't find out any actual information about the update or what features it will offer, but Key Lime Pie certainly had a presence at the conference. KLP was caught on camera twice during developer sessions, as far as we've seen. The first was an image of the Android bugdroid sitting on a bench eating a piece of key lime pie; and, the other was a screenshot of an RPG-style game where Key Lime Pie was listed in the available characters that the bugdroid could summon with his magic.
Of course, neither gives any actual info on what the update will be, but they are fun Easter eggs anyway.