So i've had 4.2 on my Galaxy nexus for a week now and the fist thing that I noticed was that my custom dictionary was gone.
words that were uncommon or ethnic first names were underlined again or autocorrected. That was fine, since I simply re-added them.

However, the annoying part was the silly auto correct on some common words.
"lol" was autocorrected to "lil"
I mean seriously??? "lol"? I think that must be the most common text message in the world, forgive the hyperbole.

Anyone else notice this more aggressive autocorrect behaviour?